Question: Consider there are four classes, A, B, C, and D, to be scheduled in either Spring 2017 or Fall 2017 semesters. Assume that (1) courses

Consider there are four classes, A, B, C, and D, to

Consider there are four classes, A, B, C, and D, to be scheduled in either Spring 2017 or Fall 2017 semesters. Assume that (1) courses A and B cannot be offered in the same semester; and (2) courses C and D must be offered in the same semester. Let X_A, X_B, X_C, and X_D be Boolean variables representing whether the corresponding courses are scheduled for spring 2017 or Fall 2017, i.e., course A is scheduled for Spring 2017 if X_A = 0, and for Fall 20167 if X_A = 1. Which of the following Boolean expressions represents both constraints (1) and (2). That is, the Boolean expression is true if and only if there is a feasible schedule for the courses that satisfies both constraints (1) and (2). a. (X_A X_B + X_A X_B) (X_C X_D + X_C X_D) b. (X_A X_B + X_A X_B) (X_C X_D + X_C X_D) c. (X_A X_B + X_A X_B) (X_C X_D + X_C X_D) d. (X_A X_B + X_A X_B) (X_C X_D + X_C X_D)

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