Question 140Electricity & Electronics - 1st Asst/Chief

The correct answer is C. The statement "These are watch cabin units extending the alarm system to engineer staterooms on vessels with periodically unmanned engine rooms" is true. The units labeled "WCU" in the accommodations are watch cabin units that provide a means to monitor the alarm system and status of the engine room in situations where the engine room may be periodically unmanned. The other options are incorrect because: A) and D) refer to "watch control units" extending remote operating system functionality, which is not what the WCU units are for in this case. B) refers to extending the alarm system to engineer staterooms on vessels with 24-hour engine room manning, which does not match the scenario described in the question.