How should you design the topology?

Your organization is deploying a single project for 3 separate departments. Two of these departments require network connectivity between each other, but the third department should remain in isolation. Your design should create separate network administrative domains between these departments. You want to minimize operational overhead.

How should you design the topology?
A . Create a Shared VPC Host Project and the respective Service Projects for each of the 3 separate departments.
B . Create 3 separate VPCs, and use Cloud VPN to establish connectivity between the two appropriate VPCs.
C . Create 3 separate VPCs, and use VPC peering to establish connectivity between the two appropriate VPCs.
D . Create a single project, and deploy specific firewall rules. Use network tags to isolate access between the departments.

Answer: C

Explanation:

https://cloud.google.com/vpc/docs/vpc-peering