A regional subnet's primary IPv4 range is almost exhausted. More addresses are needed and the larger contiguous range is available without conflicts. Which approach best fits?

1. Perform address-conflict analysis and choose a documented renumbering or translation plan.
2. Plan appropriate subnet secondary ranges for the cluster.
3. Use a custom-mode VPC with deliberately allocated subnets.
4. Expand the supported subnet primary IPv4 range after validating the new allocation.