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The owner of a music store is planning a window display of five products. Three are to be CDs selected from K, L, M, N and O and two are to be DVDs selected from R, S, T and U. The display items are to be selected according to the following conditions: (1) If K is displayed, U must be displayed (\(K \to U\)). (2) M cannot be displayed unless both L and R are also displayed (\(M \to L \land R\)). (3) If N is displayed, O must be displayed, and if O is displayed, N must be displayed (\(N \iff O\)). (4) If S is displayed, neither T nor U can be displayed (\(S \to \neg T \land \neg U\)). Which of the following is an acceptable display?

A. K, L, M, R, U
B. K, M, N, O, R
C. L, M, O, R, S
D. M, N, O, T, U
E. N, O, R, S, T
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Explanation: (A) Display: {K, L, M, R, U}. 3 CDs (K, L, M), 2 DVDs (R, U). (1) K is displayed, U is displayed. OK. (2) M is displayed, L and R are displayed. OK. (3) N and O are not displayed. OK. (4) S is not displayed. OK. All conditions met.