How can Company B reduce the number of empty responses?

Company B provides an online image recognition service and utilizes SOS to decouple system components for scalability
The SQS consumers poll the imaging queue as often as possible to keep end-to-end throughput as high as possible.
However, Company B is realizing that polling in tight loops is burning CPU cycles and increasing costs with empty
responses. How can Company B reduce the number of empty responses?

A.
Set the imaging queue visibility Timeout attribute to 20 seconds

B.
Set the Imaging queue ReceiveMessageWaitTimeSeconds attribute to 20 seconds

C.
Set the imaging queue MessageRetentionPeriod attribute to 20 seconds

D.
Set the DelaySeconds parameter of a message to 20 seconds