The correct answer is D. In this solution, the architect can suspend the Auto Scaling group's Terminate process, which will prevent the instances marked as unhealthy from being terminated. This will allow the architect to log in to the instance using Session Manager and troubleshoot the issue without losing access to the instance.

D is correct.

D is more suitable since the EC2 instances are being terminated.

https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-suspend-resume-processes.html

D. Suspend the Auto Scaling groupג€™s Terminate process. Use Session Manager to log in to an instance that is marked as unhealthy.

D is correct, I agree with acloudguru comments!

either replaceunhealthy or terminate will work. here is only D.https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-suspend-resume-processes.html

See https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-suspend-resume-processes.html it shows For Amazon EC2 Auto Scaling, there are two primary process types: Launch and Terminate. The Launch process adds a new Amazon EC2 instance to an Auto Scaling group, increasing its capacity. The Terminate process removes an Amazon EC2 instance from the group, decreasing its capacity. HealthCheck process for EC2 autoscaling is not a primary process! It is a process along with the following AddToLoadBalancer AlarmNotification AZRebalance HealthCheck InstanceRefresh ReplaceUnhealthy ScheduledActions From the requirements, Some EC2 instances are now being marked as unhealthy and are being terminated. Application is running at reduced capacity not because instances are marked unhealthy but because they are being terminated. I go with D because it is the only option that can prevent application from running at reduced capacity Option D is the answer

D is correct. You can suspend the 'ReplaceUnhealthy' process to prevent unhealthy instances from being terminated. See https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-suspend-resume-processes.html

It's D

A wrong - impossible B wrong - even with termination protection and instance scale-in protection enabled, instance will be terminated if a health check determines that an instance is unhealthy C wrong - stupid D correct - but not advised

DDD ---

D for me

A-Incorrect: disable the healthcheck won't inform which is healthy and unhealthy, remember we need to review unhealthy and we need to identify which instance in this status. B: It is the correct, Termination protection: Prevents Auto Scaling terminating protected instances, this is helpful to execute a deep diagnostics of the EC2 and identify the root cause why they are unhealthy and they are being terminating. C: Incorrect: There is not relation about unhealthy and oldest instance. D: You can't suspend the auto Scaling Terminate process.

How we can suspend Autoscaling Termination Process itself. We can suspend the processes which is running inside the instances. I hope it shoud be Option 'B'. https://aws.amazon.com/blogs/aws/new-instance-protection-for-auto-scaling/

I'll go with D

it's D