[5 Pts] Consider two decisions A and B represented by two binary decision variables ?? and ??, each of which takes 1 if the decision is made to choose it, and 0 otherwise. Select an appropriate expression from 1-8 for the constraint in each question. ?? ?? = 0 ?? ?? = 0 ?? ?? 0 ?? ?? 0 ?? ?? = 1 ?? ?? 1 ?? ?? 1 ?? ?? = 2 (a) Both A and B should be always chosen. (b) At least one of the decisions A and B should be chosen; and both can be chosen together. (c) At least one of the decisions A and B should be chosen; and both should not be chosen together. (d) Each of the decisions A and B can be chosen individually; and both should not be chosen together. (e) B can be chosen when A is chosen; but A should be chosen when B is chosen