You have an application running a specific process that is critical to the application`s functionality and has added and configured the health check process properly to your Auto Scaling Group. The instances are showing healthy. But the application itself is not working as it should. What could be the issue with the health check, since it is still showing the instances as healthy?

Answer options:

A.You do not have the time range in the health check properly configured.
B.It is not possible for a health check to monitor a process that involves the application.
C.The health check is not configured inthe correct region.
D.The health check is not checking the application process.

Answer – D
If you have custom health checks, you can send the information from your health checks to Auto Scaling so that Auto Scaling can use this information. For example, if you determine that an instance is not functioning as expected, you can set the health status of the instance to Unhealthy. The next time Auto Scaling performs a health check on the instance, it will determine that the instance is unhealthy and then launch a replacement instance.
For more information on Autoscaling health checks, please refer to the below document link: from AWS
http://docs.aws.amazon.com/autoscaling/latest/userguide/healthcheck.html