Explanation:

- Order 21, Rule 2 in the Code of Civil Procedure deals with the acknowledgment and recording of payments made out of court to a decree holder. It allows payment or adjustment to be certified, ensuring the decree reflects the correct outstanding amount.

- Order 12, Rule 5 relates to admissions and denials in pleadings during the proceedings, focusing on the preparation and simplification of issues, not payments.

- Order 14, Rule 20 concerns the framing of issues in a suit and deals with identifying factual disputes needing resolution by the court.

- Order 11, Rule 7 involves the discovery stage, focusing on interrogatories and obtaining answers for case preparation.