A web application’s performance has been degrading. Historically, the application has had highly-variable workloads, but lately, there has been a steady growth in traffic as the result of a new product launch. After reviewing several Amazon CloudWatch metrics, it is discovered that over the last two weeks the balance of CPU credits has dropped to zero several times.
Which solutions will improve performance? (Choose two.)

A. Begin using the T2 instance type
B. Purchase more CPU credits for the existing instance
C. Increase the size of the current instance type
D. Configure a CloudWatch alarm on the CPU credits metric