Your Dataproc cluster runs in a VPC subnet 172.16.20.128/25 and there are no available private IPs. You need to add new VMs that can communicate with the cluster with minimum steps. What should you do?

Expanding the existing subnet range to 172.16.20.0/24 is the most straightforward solution. This action increases the number of available IP addresses within the current subnet, allowing you to add new VMs that can directly communicate with the Dataproc cluster without complex networking configurations. This is a simple, in-place modification. Creating a new secondary IP range is not suitable for primary VM IPs. Creating a new VPC and using VPC peering introduces additional network latency and complexity, requiring more configuration steps than simply expanding the existing subnet. The option involving a new VPC with a different subnet range and custom route exchange is even more complex and unnecessary for this scenario.