Which MPLS plane is responsible for packet forwarding?

A.
packet plane

B.
control plane

C.
routing plane

D.
forwarding plane

Explanation:

MPLS compliments IP technology. It is designed to leverage the intelligence associated with IP Routing, and the Switching paradigm associated with Asynchronous Transfer Mode (ATM). MPLS consists of a Control Plane and a Forwarding Plane. The Control Plane builds what is called a "Forwarding Table," while the Forwarding Plane forwards packets to the appropriate interface (based on the Forwarding Table).
Reference:
http://www.cisco.com/en/US/tech/ CK4 36/ CK4 28/technologies_white_paper09186a00800b010f.shtml