【单选题】The general purpose personnel is carrying out maintenance work in the engine room on overtime. The work does not affect operation. At the end of normal working hours, what does the engineer on duty do...
A.
Continue with manual operated engine room until the maintenance work is finished
B.
Switch to UMS-mode, and leave the engine room
C.
Switch to UMS-mode, but inform the general purpose personnel accordingly prior to leaving the engine room