Which of the following statements are correct?
1. The first three-address instruction in the intermediate code is a leader.
2. The instruction exactly in the middle of the given three-address code is a leader.
3. Any instruction that is the target of a conditional or unconditional jump is a leader.
4. Any instruction that immediately follows a conditional or unconditional jump is a leader.
Choose the correct answer from the options given below:

1. A1, 2 and 3
2. B2, 3 and 4
3. C1, 3, 4
4. D1, 2, 3, 4

Pick an option to check yourself, or open the answer below.