Which statement concerning GMDSS Radio Operator requirements is FALSE（）.
- AEach compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at sea
- BEach compulsory vessel must carry at least two licensed Radio Operators at all times while at sea and may elect to carry a GMDSS Radio Maintainer as well
- CCommunications involving safety of life at sea do not have to be logged as long as the compulsory vessel was not involved in such communications
- DWhile at sea，adjustments to，and the maintaining of，GMDSS equipment may be performed by the GMDSS Radio operator as long as the work is supervised by an onboard licensed GMDSS Radio Maintainer