A company needs to optimize the cost of its Amazon EC2 instances. The company also needs to change the type and family of its EC2 instances every 2-3 months. What should the company do to meet these requirements?

• APurchase Partial Upfront Reserved Instances for a 3-year term.
• BPurchase a No Upfront Compute Savings Plan for a 1-year term.
• CPurchase All Upfront Reserved Instances for a 1-year term.
• DPurchase an All Upfront EC2 Instance Savings Plan for a 1-year term.