You’ve built a tiered application with backend services hosted on AWS and user front end built as an Android native mobile application. You wish to expand your user pool and have decided to build an iOS native application. What is the recommended approach to ensure your user’s data is synchronized across various user devices?

Answer options:

A.Use AWS Lambda to push user data across application clients.
B.Use AWS AppSync to synchronize data across application clients.
C.Mobile application clients should subscribe to AWS SNS topics to receive synchronization updates.
D.Use cross-region read replicas for your backend service database.

Answer: B
Option A is incorrect because it is not the most suitable solution to the problem.
Option B is CORRECT because AWS AppSync enables subscriptions to synchronize data across devices.
Option C is incorrect because it is not the most suitable solution to the problem.
Option D is incorrect because cross-region read replicas are used for cross-region disaster recovery or improving the read performance of databases.
Reference:
https://aws.amazon.com/appsync/product-details/