| Selective FEC communications (SFEC) are employed when: |
| A) Multiple stations without a group SELCALL must receive communications without using their transmitters (Radio Silence). |
| B) Multiple stations must receive communications by using their transmitters to achieve phasing. |
| C) An individual station must receive communications without using any transmitters (Radio Silence). |
| D) An individual station must receive communications by using their transmitter to achieve phasing and block other stations from breaking in. |
