Question ID:PT8 S2 Q9 Passage: Stem:Which one of the following statements must be true? Correct Answer Choice:DChoice A:If light 2 is on, then light 6 is off. Choice B:If light 3 is on, then light 2 is on. Choice C:If light 4 is on, then light 3 is off. Choice D:If light 5 is off, then light 4 is on. Choice E:If light 6 is off, then light 1 is on.