You’ve been hired as a developer to work on an application. This application is hosted on an EC2 Instance and interacts with an SQS queue. It’s been noticed that when the application is pulling messages, a lot of empty responses are being returned. What change can you make to ensure that the application uses the SQS queue effectively?

Answer options:

A.Use long polling
B.Set a custom visibility timeout
C.Use short polling
D.Implement exponential backoff.

Answer - A
Option B is invalid because this is valid only for the processing time for the Messages.
Option C is invalid because this would not be a cost-effective option.
Option D is invalid because this is not a practice for SQS queues.
The AWS Documentation mentions the following.
Long polling helps reduce the cost of using Amazon SQS by eliminating the number of empty responses (when there are no messages available for a ReceiveMessagerequest) and false empty responses (when messages are available but aren`t included in a response).
For more information on long polling in SQS, please refer to the below link-
https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-long-polling.html