Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）
- AIf no answer is received on the designated distress frequencies，repeat the distress call on any frequency available
- BChannel 16 (156.8) may be used for distress messages
- CIt is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
- DDistress messages should first be transmitted on 2182 kHz