A Company Hosts Its Website on AWS

A company hosts its website on AWS. To address the highly variable demand, the company has implemented Amazon EC2 Auto Scaling. Management is concerned that the company is over-provisioning its infrastructure, especially at the front end of the three-tier application. A solutions architect needs to ensure costs are optimized without impacting performance. What should the solutions architect do to accomplish this?

A) Use Auto Scaling with Reserved Instances.
B) Use Auto Scaling with a scheduled scaling policy.
C) Use Auto Scaling with the suspend-resume feature.
D) Use Auto Scaling with a target tracking scaling policy.