You manage a large datacenter that has limited physical space. You plan to extend your datacenter
to Azure. You need to create a connection that supports a multiprotocol label switching (MPLS)
virtual private network. Which connection type should you use?

A.
Site-to-site

B.
VNet-VNet

C.
ExpressRoute.

D.
Site-to-peer

Explanation:
ExpressRoute provides even richer capabilities by allowing a dedicated MPLS connection to Azure.
http://azure.microsoft.com/en-us/services/expressroute/