Explanation: Compulsory vessels, typically large commercial ships, are subject to the Global Maritime Distress and Safety System (GMDSS) regulations. A fundamental aspect of GMDSS is that the required radio equipment carriage is determined by the specific sea areas in which the vessel operates (Sea Areas A1, A2, A3, or A4). Each sea area dictates different minimum equipment to ensure communication capabilities for distress and safety. Therefore, a vessel's intended sea area directly governs its equipment carriage requirements. Answer A is incorrect because GMDSS regulations generally require at least one properly licensed GMDSS Radio Operator on watch, not two in all sea areas. Answer C is incorrect because while transmitting and responding to Distress alerts is a primary GMDSS function, stating "only one (1) FCC licensed GMDSS Radio Operator" is not a universal or precise carriage requirement; multiple operators may be on board, and the regulations focus on watchkeeping requirements.