Which of the following is a way to use Amazon EC2 Auto Scaling groups to scale capacity in the AWS Cloud?

Which of the following is a way to use Amazon EC2 Auto Scaling groups to scale capacity in the AWS Cloud?
A . Scale the number of EC2 instances in or out automatically, based on demand.
B . Use serverless EC2 instances.
C . Scale the size of EC2 instances up or down automatically, based on demand.
D . Transfer unused CPU resources between EC2 instances.

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Answer: A