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A company uses an Amazon Simple Queue Service (Amazon SQS) queue and Amazon EC2 instances...

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A company uses an Amazon Simple Queue Service (Amazon SQS) queue and Amazon EC2 instances in an Auto Scaling group with target tracking for a web application. The company collects the ASGAverageNetworkIn metric but notices that instances do not scale fast enough during peak traffic. There are a large number of SQS messages accumulating in the queue.

A CloudOps engineer must reduce the number of SQS messages during peak periods.

Which solution will meet this requirement?

A.

Define and use a new custom Amazon CloudWatch metric based on the SQS ApproximateNumberOfMessagesDelayed metric in the target tracking policy.

B.

Define and use Amazon CloudWatch metric math to calculate the SQS queue backlog for each instance in the target tracking policy.

C.

Define and use step scaling by specifying a ChangeInCapacity value for the EC2 instances.

D.

Define and use simple scaling by specifying a ChangeInCapacity value for the EC2 instances.

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