An administrator is deploying an NC2 cluster on AWS in the us-west-2 region. A VPC, management subnet, and a VM subnet are already created in the target region.
The management subnet has a local route and a route to the Internet. The VM subnet has a local route and a route to the NAT gateway. During the deployment, the management subnet appears in the drop-down list in the Create Cluster wizard, but cannot be selected.
What is the cause of this problem?