Question 64 under the 2011 specialty

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64. Which of the following statements regarding the installation of flame arrestors are correct? A. A flame arrester should be installed on the direct vent pipeline of storage tanks whose flash point is 28°C or lower, or whose maximum operating temperature is equal to or higher than their flash point. B. For pipelines transporting explosive mixtures that could cause explosions or detonations, a pipeline flame arrester should be installed at the inlet to the receiving equipment. C. A flame arrester or flame suppression device should be installed on the pipeline before the gases emitted from the flare enter the flare tip. D. Tank flame arresters should be installed directly on the pipe outlets at the top of the storage tanks; they are usually used in conjunction with breather valves rather than alone. Option A is definitely incorrect, while options B and C are correct. I think D is the correct answer; I wonder if other sea friends think D is the right choice?