**II. {3, 4}**: 3 AND 4 = 011 AND 100 = 0. 3 OR 4 = 111 = 7. **Valid.** - **III. {1, 6}**: 1 AND 6 = 001 AND 110 = 0. 1 OR 6 = 111 = 7. **Valid.** - **IV. {1, 2, 3}**: 1 AND 3 = 001 AND 011 = 001 != 0. **Invalid** (overlapping). - **V. {5, 2}**: 5 AND 2 = 101 AND 010 = 0. 5 OR 2 = 111 = 7. **Valid.*