The task of _________ can not be executed by the holder of GMDSS General Operator's Certificates.
A. any adjustments or maintenance, which may affect the proper operation of the MF/HF radio station.
B. replacement of consumable items such as paper, ribbons, etc.
C. resetting tripped circuit breakers or replacing defective fuses.
D. routine battery maintenance, if used as part of the GMDSS station.