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Why is SQS an appropriate service for this scenario?

A company has a workflow that sends video files from their on-premise system to AWS for
transcoding. They use EC2 worker instances that pull transcoding jobs from SQS. Why is
SQS an appropriate service for this scenario?

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A.
SQS guarantees the order of the messages.

B.
SQS synchronously provides transcoding output.

C.
SQS checks the health of the worker instances.

D.
SQS helps to facilitate horizontal scaling of encoding tasks.

Explanation:
Imho the idea for SQS is to improve scalability.
Elastic Beanstalk is checking the health of EC2 instances, not sure if SQS does.

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