Question: What is the set of possible values that `a` may contain?

1. 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
2. 1, 2, 12
3. 2, 11, 12
4. 1, 12

Answer: The correct answer of the above question is Option B:1, 2, 12