【单选题】Which statement is false regarding the maintenance of GMDSS equipment at sea?
A.
The GMDSS operator may not be the person designated to have primary responsibility for radio communications during distress incidents.
B.
Ships must carry at least one person who qualifies as a GMDSS maintainer for the maintenance and repair of equipment if the at sea maintenance option is selecte
C.
All at sea maintenance and repairs must be performed by, or under the supervision of a person holding a GMDSS First/Second Class Radio Electronic Certificate.
D.
The GMDSS maintainer may be the person responsible for ensuring that the watches are properly maintained and that the proper guard channels and the vessel’s position are entered in the DSC equipment.