An application runs on Amazon EC2 instances behind an Application Load Balancer (ALB). A DevOps Engineer is using AWS CodeDeploy to release a new version. The deployment fails during the AllowTraffic lifecycle event, but a cause for the failure is not indicated in the deployment logs.
What would cause this?

A. The appspec.yml file contains an invalid script to execute in the AllowTraffic lifecycle hook.
B. The user who initiated the deployment does not have the necessary permissions to interact with the ALB.
C. The health checks specified for the ALB target group are misconfigured.
D. The CodeDeploy agent was not installed in the EC2 instances that are part of the ALB target group.