Explanation:

- Section 75: It deals with "public documents" and outlines what constitutes a public document but doesn't specifically mention presumption of genuineness for certified copies.

- Section 79: This section deals with the presumption as to the genuineness of certified copies. When a certified document is presented, it is presumed to be genuine unless proven otherwise.

- Section 69: Focuses on proof and requirements for proving the execution of a will, not relevant to certified copies.

- Section 72: Relates to documents not proved under Section 68 and is about proving attested documents by secondary evidence.