Explanation:

- Option 1: Copies of that document

- This includes photocopies, scans, or any reproduction of the original document.

- Such copies serve as a secondary form of evidence when the original is unavailable.

- Option 2: Oral account of the contents of the documents

- Witnesses verbally recount the content of a document they have seen.

- This is used when a physical copy is not present.

- Option 3: Both (a) & (b)

- Both reproductions and oral accounts are valid secondary evidence forms.

- This option reflects a comprehensive understanding of secondary evidence.

- Option 4: Only (a) & not (b)

- This implies only physical reproductions are secondary evidence.

- It excludes verbal accounts, which is incorrect.

The correct answer is:

- Option 3: Both (a) & (b)