The correct answer is D) None of the above. The statement is true because both A and B are incorrect. According to the GMDSS regulations: 1) Key letters or abbreviations can be used in GMDSS radio logbooks as long as they are properly defined. 2) Urgency communications do need to be entered in the GMDSS radio log, as the log must contain a record of all distress, urgency, and safety communications. Therefore, neither A nor B is a true statement, making D) None of the above the correct answer.