Explanation:

- The Supreme Court has the discretion to grant special leave to appeal under Article 136 of the Indian Constitution.

- It is generally exercised only in exceptional cases where the regular channels of appeal may not provide justice.

- Courts may grant special leave in cases where there is a violation of the rule of Natural Justice – for example, if a party was not given a fair hearing.

- Special leave can also be granted in cases where grave and substantial injustice has been done, even if all legal steps have been followed.

- All these grounds are valid for the Supreme Court to grant special leave, making option 4 the correct answer.

Correct Answer: Option 4 – all of these.