What is the proper procedure to be followed upon receipt of a Distress alert transmitted by use of Digital Selective Calling techniques?

Correct Answer: Option B — Set watch on the radiotelephone Distress and Safety frequency associated with the Distress and Safety calling frequency on which the Distress alert was received.

Upon receiving a DSC distress alert, the operator must immediately tune the associated radiotelephone equipment to the corresponding distress and safety frequency. This allows for the reception of follow-on voice communications, which are essential for coordinating search and rescue efforts as defined by IMO GMDSS operational procedures.