The following questions refer to an advertisement budgeting problem involving printing of five magazines represented by binary variables m1, m2, m3, m4, and m5. a. write a constraint modeling a situation in which two of the magazines m1, m4, and m5 must be printed. b. write a constraint modeling a situation in which, if m2 or m3 is printed, they must both be printed. c. write a constraint modeling a situation in which magazine m1 or m3 must be printed, but not both. d. write a constraint modeling a situation where m2 cannot be printed unless both magazines m3 and m5 are also printed. e. write a constraint in which not more than 4 of all the five magazines have to be printed. f. write a constraint in which exactly five of the magazines are printed.