A company runs an application on an Amazon EC2 instance. A SysOps administrator creates an Auto Scaling group and an Application Load Balancer (ALB) to handle a...

A company runs an application on an Amazon EC2 instance. A SysOps administrator creates an Auto Scaling group and an Application Load Balancer (ALB) to handle an increase in demand. However, the EC2 instances are failing the health check.
What should the SysOps administrator do to troubleshoot this issue?

A. Verify that the Auto Scaling group is configured to use all AWS Regions. B. Verify that the application is running on the protocol and the port that the listener is expecting. C. Verify the listener priority in the ALB. Change the priority if necessary. D. Verify the maximum number of instances in the Auto Scaling group. Change the number if necessary.