Question ID:PT83 S4 Q17 Passage:The operator of a passenger railway system needs to close at least one of its stations. Six stations‚ L, M, N, P, Q, and R‚ are being considered for closure. The decision regarding which stations to close and which to keep open is subject to the following constraints:N and R cannot both close.If N stays open, then L must also stay open.If R stays open, then M must also stay open.L and R cannot both stay open. Stem:Which one of the following, if substituted for the constraint that if R stays open, then M must also stay open, would have the same effect in determining which stations close and which stay open? Correct Answer Choice:AChoice A:If L closes, then M must stay open. Choice B:If L closes, then R must stay open. Choice C:If R closes, then L must stay open. Choice D:If L stays open, then M must close. Choice E:If M stays open, then N must close.