An application running on Amazon EC2 instances in an Auto Scaling group across multiple Availability Zones was deployed using an AWS CloudFormation template. The SysOps team has patched the Amazon Machine Image (AMI) version and must update all the EC2 instances to use the new AMI.
How can the SysOps Administrator use CloudFormation to apply the new AMI while maintaining a minimum level of active instances to ensure service continuity?

A. Run the aws cloudfomation update-stack command with the – rollback-configuration option
B. Update the CloudFormation template with the new AMI ID, then reboot the EC2 instances
C. Deploy a second CloudFormation stack and use Amazon Route 53 to redirect traffic to the new stack
D. Set an AutoScalingRollingUpdatepolicy in the CloudFormation template to update the stack.