You Have a Fleet of Elastic Compute Cloud (EC2) Instances

Multiple Choice

You have a fleet of Elastic Compute Cloud (EC2) instances in an Auto Scaling group. All of these instances are running Microsoft Windows Server 2012 backed by Amazon Elastic Block Store (EBS) . These instances were launched through AWS CloudFormation. You have determined that your instances are underutilized, and in order to save some money, have decided to modify the instance type of the fleet. In which of the following ways can you achieve the desired result during a scheduled maintenance window? (Choose two.)

A) Create a new Auto Scaling launch configuration specifying the new instance type, associate it to the existing Auto Scaling group, and terminate the running instances.
B) Identify the new instance type in the user data and restart the running instances one at a time.
C) Use the AWS Command Line Interface (CLI) to modify the instance type of each running instance.
D) Change the instance type in the AWS CloudFormation template that was used to create the Amazon EC2 instances, and then update the stack.
E) Take snapshots of the running instances, and launch new instances based on those snapshots.