You Are Configuring a VPLS Spoke Termination to a VPRN

You are configuring a VPLS spoke termination to a VPRN on a Nokia 7750 SR. The spoke SDP is running over a NULL encapsulated network port. The best practice is to set the VPRN interface "ip-mtu" equal to what value?

A) The SDP path MTU minus 14
B) The LMTU found in 'show router ldp bindings' on the VPLS side of the spoke SDP
C) The configured service-mtu of the VPLS service
D) The LMTU found in 'show router ldp bindings' on the VPLS side of the spoke SDP minus 14
E) The SPD path MTU