Which of the following is the appropriate set of test cases, (A, B) when the part of a program shown is tested by decision condition coverage…

Which of the following is the appropriate set of test cases, (A, B) when the part of a program shown is tested by decision condition coverage (branch coverage)?

if(A OR B) X = X+1;
else X = X-1;

1. a) {(False, True)}
2. b) {(False, True), (True, False), (True, True)}
3. c) {(False, True), (True, False)}
4. d) {(False, False), (True, True)}