The correct answer is D) All of the above. Proper GMDSS (Global Maritime Distress and Safety System) watchkeeping includes understanding the normal operational indicators on the GMDSS console, maintaining a proper GMDSS radio station log, and responding to and comprehending alarms. These three elements are all essential components of effective GMDSS watchkeeping, as required by international maritime regulations and best practices. The other options, while not incorrect, do not fully capture the complete scope of proper GMDSS watchkeeping responsibilities. Understanding the console, logging activities, and responding to alarms are all crucial aspects that must be demonstrated by a Coast Guard-licensed mariner to ensure the effective operation and monitoring of the GMDSS system.