While proceeding to a distress site，you hear the words “Seelonce mayday” on the radiotelephone.Which action should you take（）.
- AResume base course and speed as your assistance is no longer required
- BAcknowledge receipt and advise your course，speed，and ETA
- CRelay the original distress message as no other vessel has acknowledged it
- DMonitor the radiotelephone but do not transmit