When placing a TELEX call to a Coast Station, you should always:

Correct Answer: Option B — Make sure the frequency is not occupied with normal traffic.

ITU-R M.493 and M.625 standards mandate that operators verify a channel is clear before initiating transmission. This prevents harmful interference with ongoing traffic or distress communications. Always monitor the frequency for existing data bursts or voice traffic to ensure compliance with GMDSS spectrum management protocols and avoid collisions during NBDP operations.