You recently deployed Compute Engine instances in regions us-west1 and us-east1 in a Virtual Private Cloud (VPC) with default routing configurations. Your company security policy mandates that virtual machines (VMs) must not have public IP addresses attached to them. You need to allow your instances to fetch updates from the internet while preventing external access. What should you do?

A. Create a Cloud NAT gateway and Cloud Router in both us-west1 and us-east1. B. Create a single global Cloud NAT gateway and global Cloud Router in the VPC. C. Change the instances’ network interface external IP address from None to Ephemeral. D. Create a firewall rule that allows egress to destination 0.0.0.0/0.