Which statement about the Cisco MPLS TE forwarding adjacency feature is true?

Which statement about the Cisco MPLS TE forwarding adjacency feature is true?

A. It enables the MPLS core to use EIGRP as the routing protocol. B. It enables the Cisco MPLS TE tunnel to be advertised into the running IGP. C. It enables the tailend router to advertise routes to the headend router over the tunnel. D. It enables the headend and tailend routers to establish a bidirectional tunnel.