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

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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.

Answer: A