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

Which statement about LDP Session Protection and LDP-IGP sync is true?
A . Both LDP features cannot be used at the same time in a MPLS LDP enabled network
B . 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
C . 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
D . Both LDP features must be used together to increase fast convergence on an MPLS LDP-enabled network

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Answer: D