A Distress Priority DSC call may be formatted and transmitted specifying and requesting:

Correct Answer: Option B — Nature of Distress or alternate frequency but not both in a single call, vessel position or alternate frequency/emission but not both in a single call, voice or TELEX follow-up communications.

DSC distress alerts are limited by data field constraints. An operator must choose between specifying the nature of distress or an alternate frequency, and between position or alternate emission, within a single call. This ensures the alert remains within the standardized packet length required for reliable transmission and decoding.