Which statement about LDP Session Protection and LDP IGP sync is true? 

Answer options:

A. Both LDP features must be used together to increase fast convergence on a MPLS LDP-enabled network.
B. Both LDP features cannot be used at the same time in a MPLS LDP enabled network.
C. LDP Session Protection re-exchanges label information when a down-up event occurs LDP-IGP sync keeps the adjacency and label information in a down-up event.
D. LDP-IGP sync re-exchanges label information when a down-up event occurs; LDP Session Protection keeps the adjacency and label information in a down-up event.

A