An Organization Has Been Running Their Website on Several M2

An organization has been running their website on several m2 Linux instances behind a Classic Load Balancer for more than two years. Traffic and utilization have been constant and predictable. What should the organization do to reduce costs?

A) Purchase Reserved Instances for the specific m2 instances.
B) Change the m2 instances to equivalent m5 types, and purchase Reserved Instances for the specific m5 instances.
C) Change the Classic Load Balancer to an Application Load Balancer, and purchase Reserved Instances for the specific m2 instances.
D) Purchase Spot Instances for the specific m2 instances.