| Which statement is correct regarding HF NBDP under GMDSS? |
| A) Safety communications by direct-printing telegraphy should be in the ARQ mode when communicating with the U.S. Coast Guard or other coast stations on channels that they normally guard. |
| B) Distress communications other than directly to the Coast Guard or other coast stations on the channels that they normally guard, should be in the broadcast SSB mode. |
| C) The ARQ mode may not be used subsequently to the FEC mode even when it is advantageous to do so. |
| D) Distress communications other than directly to the Coast Guard or other coast stations on the channels that they normally guard, should be in the broadcast FEC or SSB mode. |
