Which statement is false regarding the maintenance requirement for GMDSS-equipped vessels?
A．On ships engaged on voyages in sea areas A1 and A2, maintenance availability must be ensured by Duplication of Equipment, Shore-based Maintenance, or At-sea Maintenance capability or a combination of these.
B．On ships engaged on voyages in sea areas A2 and A3 , maintenance availability must be ensured by using a combination of at least two choices between Duplication of Equipment, Shore-based Maintenance, or At-sea Maintenance capability.
C．If the shore-based maintenance method is used, maintenance services must be completed and performance verified and noted in the ship's record before departure from the first port of call entered after any failure occurs.
D．All at-sea maintenance and repairs must be performed by, or under the supervision of a person holding a suitable GMDSS license.
