Contoso has two ExpressRoute circuits: one in the East US peering location connecting their New York data center, and one in the West Europe peering location connecting their Amsterdam data center. Each circuit is linked to an ExpressRoute gateway in a separate Azure VNet. The network team needs the New York and Amsterdam on-premises sites to communicate directly with each other over the Microsoft backbone, without routing traffic through an Azure VNet or the public internet. Which solution meets this requirement?