What action should be taken to meet the requirements?
Ensure that both accounts are linked and are part of consolidated billing to create a file sharing network, and then enable VPC peering.
Ensure that both VPC owners manually add a route to the VPC route tables that points to the IP address range of the other VPC.
Instruct the customer to set up a VPC with the same IPv4 CIDR block as that of the source VPC: 172.16.0.0/16.
Instruct the customer to create a virtual private gateway to link the two VPCs.
Explanations:
Consolidated billing and file sharing are not required for VPC peering. VPC peering is based on routing, not billing.
To enable communication between VPCs, both VPCs need to have routes pointing to each other’s IP range. This is done by adding appropriate routes in the route tables.
Both VPCs must have unique CIDR blocks. Having the same CIDR block would cause a conflict and prevent peering.
A virtual private gateway is used for VPN connections, not for VPC peering. Peering requires direct routes between VPCs, not a virtual private gateway.
To the best of my knowledge, the answer is:
Ensure that both VPC owners manually add a route to the VPC route tables that points to the IP address range of the other VPC.