Azure Stream Analytics use case and questions

We are preparing for the certification. Below is case study and questions. I have marked some answers in bold (which I feel). Please help me with answers and the justification. What I feel is these answers will defer case by case. Thank you.

ABCD, Inc Overview General Overview - ABCD, Inc. is a company that manufactures personal devices to track physical activity and other health-related data. ABCD has a health tracking application that sends health-related data horn a user's personal device to Microsoft Azure. Physical Locations ABCD has three development and commercial offices. The offices are located in the United States, France, and China. ABCD products are sold worldwide. ABCD has commercial representatives in more than 80 countries. Existing Environment Environment - In addition to using desktop computers in all of the offices. ABCD recently started using Microsoft Azure resources and services for both development and operations. ABCD has an Azure Machine Learning Solution. ABCD Health Tracking Application ABCD recently extended its platform to provide third-party companies with the ability to upload data from devices to Azure. The data can be aggregated across multiple devices to provide users with a comprehensive view of their global health activity. While the upload from each device is small, potentially more than 100 million devices will upload data daily by using an Azure event hub. Each health activity has a small amount of data, such as activity type, start date/time, and end date/time. Each activity is limited to a total of 3 KB and includes a customer Identification key. In addition to the ABCD health tracking application, the users' activities can be reported to Azure by using an open API. Machine Learning Experiments The developers at ABCD perform Machine Learning experiments to recommend an appropriate health activity based on the past three activities of a user. The ABCD developers train a model to recommend the best activity for a user based on the hour of the day. Requirements Planned Changes - ABCD plans to extend the existing dashboard features so that health activities can be compared between the users based on age, gender, and geographic region. Business Goals - Minimize the costs associated with transferring data from the event hub to Azure Storage. Technical Requirements - ABCD identities the following technical requirements: Data from the devices must be stored from three years in a format that enables the fast processing of data fields and Filtering. The third-party companies must be able to use the ABCD Machine learning models to generate recommendations to their users by using a third-party application. Any changes to the health tracking application must ensure that the ABCD developers can run the experiments without interrupting or degrading the performance of the production environment. Privacy Requirements - Activity tracking data must be available to all of the ABCD developers for experimentation. The developers must be prevented from accessing the private information of the users. Other Technical Requirements - When the ABCD health tracking application asks users how they feel, their responses must be reported to Azure.

Question: 1 You need to recommend a data handling solution to support the planned changes to the dashboard. The solution must meet the privacy requirements. What is the best recommendation to achieve the goal? More than one answer choice may achieve the goal. Select the BEST answer. A. anonymization B. encryption C. obfuscation D. compression

Question: 2 You need to recommend a data transfer solution to support the business goals. What should you recommend? A. Configure the health tracking application to cache data locally for 24 hours. B. Configure the health tracking application to Aggregate activities in blocks of 128 KB. C. Configure the health tracking application to cache data locally tor 12 hours. D. Configure the health tracking application to aggregate activities in blocks of 64 KB.

Question: 3 You need to recommend a permanent Azure Storage solution for the activity data. The solution must meet the technical requirements. What is the best recommendation to achieve the goal? More than one answer choice may achieve the goal. Select the BEST answer. A. Azure SQL Database B. Azure Queue storage C. Azure Blob storage D. Azure Event Hubs

Question: 4 Users report that when they access data that is more than one year old from a dashboard, the response time is slow. You need to resolve the issue that causes the slow response when visualizing older dat a. What should you do? A. Process the event hub data first, and then process the older data on demand. B. Process the older data on demand first, and then process the event hub data. C. Aggregate the older data by time, and then save the aggregated data to reference data streams. D. Store all of the data from the event hub in a single partition.

Question: 5 You extend the dashboard of the health tracking application to summarize fields across several users. You need to recommend a file format for the activity data in Azure that meets the technical requirements. What is the best recommendation to achieve the goal? More than one answer choice may achieve the goal. Select the BEST answer.

A. ORC B. TSV C. CSV D. JSON E. XML