When sending a DSC call:

Correct Answer: Option B — Vessel's position will automatically be sent if the vessel is sending a "Distress Hot Key" alert.

Under IMO GMDSS standards, pressing the dedicated "Distress Hot Key" (or red button) automatically transmits a pre-formatted distress alert. This alert includes the vessel's current GPS position and time, provided the DSC controller is interfaced with a functional electronic navigation receiver.