![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Which statement is correct?
A.
FEC requests are first acknowledged by the vessel' s transmitter before broadcasts can be received, '
B.
FEC mode broadcasts can be received without the transmitter being tumed on
C.
) Weather'broadcasts are always made in ARQ mode to ensure reception.
D.
FEC mode improves the efficiency of communication.