Explanation:

- Section 115 of the Civil Procedure Code (CPC): This section pertains to the process of revision.

- Reference (Option 1): This is the process of referring a question to a higher court that has arisen in a case. It's generally used for questions of law.

- Review (Option 2): A review involves the reconsideration of a court’s own judgment. This can be requested if there's a mistake or error on the face of the record.

- Revision (Option 3): Revision involves a higher court’s examination of a lower court's decision. It's used to correct jurisdictional errors and ensure justice.

- Appeal to the Supreme Court (Option 4): This is when a case is taken to the Supreme Court to overturn or uphold a lower court's decision.