As a DevOps engineer, you use a CloudFormation stack to maintain an Auto Scaling group and a launch template. When there is an update in the launch template, you would update the stack with the new CloudFormation template. You need to ensure that the CloudFormation stack creates a new Auto Scaling group during the update and deletes the old Auto Scaling group during the cleanup process. Which of the following UpdatePolicy attributes would you configure in the CloudFormation template?

Answer options:

A.UpdatePolicy:
AutoScalingReplacingUpdate:
WillReplace: true
B.UpdatePolicy:
AutoScalingReplacingUpdate:
WillReplace: false
C.UpdatePolicy:
AutoScalingRollingUpdate:
MinInstancesInService: 0
WaitOnResourceSignals: true
D.UpdatePolicy:
AutoScalingScheduledAction:
IgnoreUnmodifiedGroupSizeProperties: true

Correct Answer: A
Option A is CORRECT because the AutoScalingReplacingUpdate policy should be used for CloudFormation to handle replacement updates for the Auto Scaling group. The WillReplace property needs to be true as it specifies whether the Auto Scaling group and the instances it contains are replaced during an update.
Option B is incorrect because the WillReplace property needs to be true as the above explanations.
Option C is incorrect because with the AutoScalingRollingUpdate policy, CloudFormation handles rolling updates for an Auto Scaling group. It does not launch a new Auto Scaling group.
Option D is incorrect because the AutoScalingScheduledAction policy is used to update an associated scheduled action for an Auto Scaling group. It does not meet the requirements of the question.
Reference:
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-attribute-updatepolicy.html