A network must span multiple Google Cloud regions with separate regional subnets while retaining one logical VPC network. Which approach best fits?

1. Design a Shared VPC with a host project and authorized service projects.
2. Allocate non-overlapping VPC and on-premises address ranges before connecting networks.
3. Use the global VPC resource with appropriately placed regional subnets.
4. Replace the assumption with an explicitly supported transit connectivity design.