15C4 B
 Which of the following statements concerning MMSI is true?
A. Coast station MMSI numbers have 9 digits starting with 4.
B. All MMSI numbers are 9 digits and contain an MID.
C. Ship station MMSI numbers can be 7 digits or 9 digits depending on the Inmarsat terminal.
D. Group MMSI numbers must begin with 2 zeros.
