A company has developed an application that uses AWS Lambda functions to process messages from...

Why Option B is Correct:Setting the visibility timeout ensures that once a message is being processed, it is temporarily hidden from other consumers. The Lambda function must delete processed messages to avoid re-processing when the visibility timeout expires.

Why Other Options are Incorrect:

Option A:Message retention affects how long messages stay in the queue, not how they are processed.

Option C:Receive message wait time optimizes long polling but does not prevent re-processing.

Option D:Delivery delay introduces latency for new messages and does not address message re-processing.

AWS Documentation References:

Using SQS Visibility Timeout