On Cisco IOS XR software, how is LDP enabled on an interface?

On Cisco IOS XR software, how is LDP enabled on an interface?
A . LDP is automatically enabled globally on all interfaces, when ip cef is enabled globally.
B . LDP is enabled on each interface, using the mpls ip interface configuration command.
C . LDP is enabled on each interface, using the interface command under mpls ldp (MPLS LDP configuration mode).
D . LDP is enabled globally on all interfaces, using the mpls ldp global configuration command.
E . LDP is enabled globally on all interfaces, using the mpls ip global configuration command.

View Answer

Answer: C