Which strategy meets these requirements with the MOST operational efficiency?

A company stores session history for its users in an Amazon DynamoDB table. The company has a large user base and generates large amounts of session data.

Teams analyze the session data for 1 week, and then the data is no longer needed. A database specialist needs to design an automated solution to purge session data that is more than 1 week old.

Which strategy meets these requirements with the MOST operational efficiency?
A . Create an AWS Step Functions state machine with a DynamoDB DeleteItem operation that uses the ConditionExpression parameter to delete items older than a week. Create an Amazon EventBridge (Amazon CloudWatch Events) scheduled rule that runs the Step Functions state machine on a weekly basis.
B. Create an AWS Lambda function to delete items older than a week from the DynamoDB table. Create an Amazon EventBridge (Amazon CloudWatch Events) scheduled rule that triggers the Lambda function on a weekly basis.
C. Enable Amazon DynamoDB Streams on the table. Use a stream to invoke an AWS Lambda function to delete items older than a week from the DynamoDB table
D. Enable TTL on the DynamoDB table and set a Number data type as the TTL attribute. DynamoDB will automatically delete items that have a TTL that is less than the current time.

View Answer

Answer: D

Explanation:

https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html