An application is deployed in an Auto Scaling group with an Application Load Balancer. One day, you updated the AMI ID used by the ASG and increased the desired number of instances. However, you found that the new instance failed the health check of the ALB target group and was terminated by the Auto Scaling group. Then the ASG recreated a new instance which would be terminated again after some time. You want to isolate one of the new instances for troubleshooting and this instance must be in service for at least one day. Which of the following methods can achieve the requirement? (SelectTWO.)

Answer options:

A.Modify the AMI ID to the previous one in the launch template of the Auto Scaling group.
B.In the ASG health check configuration, disable the health check provided by Elastic Load Balancing (ELB).
C.Put the instance in the Standby state to temporarily remove it from the Auto Scaling group.
D.Put the instance in the Pending:Wait state for 24 hours by adding a lifecycle hook with the default timeout.
E.Decrease the desired number of the instances in the Auto Scaling group.

Correct Answers: B and C
Option A is incorrect because the new instance will be recreated with the previous AMI ID. There will be no instances with the new AMI for you to troubleshoot the issue.
Option B is CORRECT because after you disable the ELB health check in the ASG configuration, the new instance will not be terminated by the ASG and is available for further troubleshooting.
Option C is CORRECT because after the instance is put in the Standby state, the instance does not belong to the ELB target group or ASG so that it will not be terminated.
Option D is incorrect because the default timeout of lifecycle hook is 1 hour. After the timeout, the instance will become unhealthy in the Auto Scaling group and be terminated.
Option E is incorrect because this method cannot isolate a new instance for you to debug the issue.
Reference:
https://docs.aws.amazon.com/autoscaling/ec2/userguide/healthcheck.html,
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-enter-exit-standby.html