Which AWS services would be best to use to accomplish this?

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You have been given a scope to deploy some AWS infrastructure for a large organisation. The requirements are that you
will have a lot of EC2 instances but may need to add more when the average utilization of your Amazon EC2 fleet is high
and conversely remove them when CPU utilization is low. Which AWS services would be best to use to accomplish this?

A.
Amazon CloudFront, Amazon CloudWatch and Elastic Load Balancing.

B.
Auto Scaling, Amazon CloudWatch and AWS CloudTrail.

C.
Auto Scaling, Amazon CloudWatch and Elastic Load Balancing.

D.
Auto Scaling, Amazon CloudWatch and AWS Elastic Beanstalk.

Explanation:
Auto Scaling enables you to follow the demand curve for your applications closely, reducing the need to manually
provision Amazon EC2 capacity in advance. For example, you can set a condition to add new Amazon EC2 instances in
increments to the Auto Scaling group when the average utilization of your Amazon EC2 fleet is high; and similarly, you
can set a condition to remove instances in the same increments when CPU utilization is low. If you have predictable load
changes, you can set a schedule through Auto Scaling to plan your scaling activities. You can use Amazon CloudWatch
to send alarms to trigger scaling activities and Elastic Load Balancing to help distribute traffic to your instances within
Auto Scaling groups. Auto Scaling enables you to run your Amazon EC2 fleet at optimal utilization.
http://aws.amazon.com/autoscaling/

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