Explanation:

- The presumption of due execution and authentication of a power of attorney under Section 85 of the Evidence Act occurs when certain conditions are met.

- The key requirement is that the power of attorney must be executed before and authenticated by a specific official.

- Option 1: Notary

- Notaries are authorized to authenticate documents, including powers of attorney.

- Option 2: Judge

- Judges are judicial officials with the authority to authenticate legal documents.

- Option 3: Magistrate

- Magistrates, like judges, can authenticate legal documentation.

- Option 4: All the above

- This option covers all the officials mentioned above, any of whom can authenticate a power of attorney.