You’re trying to configure an AWS Elastic Beanstalk worker tier for easy debugging, and there are problems finishing queue jobs. Which of the following worker environment feature will help us debug issues with unprocessed jobs?

Answer options:

A.Rolling Deployments.
B.Enhanced Health Reporting
C.Blue-Green Deployments.
D.Dead Letter Queue

Answer – D
Elastic Beanstalk worker environments support Amazon Simple Queue Service (SQS) dead letter queues. A dead letter queue is a queue where other (source) queues can send messages that for some reason could not be successfully processed. A primary benefit of using a dead letter queue is the ability to sideline and isolate the unsuccessfully processed messages. You can then analyze any messages sent to the dead letter queue to try to determine why they were not successfully processed.
For more information on Elastic beanstalk and dead letter queues, please visit the below URL:
http://docs.aws.amazon.com/elasticbeanstalk/latest/dg/using-features-managing-env-tiers.html#worker-deadletter