Question 3655 Deck General

The correct answer is C) coaming. The reasoning is that when foam extinguishing systems are provided on a MODU (Mobile Offshore Drilling Unit), each machinery flat in the protected space must have a coaming installed. A coaming is a raised edge or lip around the perimeter of the machinery flat, which helps to contain and channel the foam discharge in the event of a fire. The other options are incorrect because an alarm would not be a physical feature of the machinery flat, a drain would not be required specifically for the foam system, and a fire sensor would be part of the overall fire detection system, not a physical component of the machinery flat.