AWS Certified Developer Associate Practice Test 4

Correct answer - "Cognito Sync" : Amazon Cognito Sync is an AWS service and client library that enables cross-device syncing of application-related user data. You can use it to synchronize user profile data across mobile devices and the web without requiring your own backend

Incorrect:

"Cognito Identity Pools" - Amazon Cognito identity pools provide temporary AWS credentials for users who are guests

"S3" - S3 is a storage service that can be used from different devices however when you are dealing with mobile app user data and syncing data Cognito Sync becomes a better solution as the client libraries cache data locally so your app can read and write data regardless of device connectivity status.

"EFS" - With Amazon EFS, you can create a file system, mount the file system on an Amazon EC2 instance, and then read and write data to and from your file system

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