Explanation:

- Section 165 of the Evidence Act: This section allows the judge to ask any question, in any form, at any stage, about any fact relevant or otherwise, to discover or obtain proper proof of relevant facts.

- Option 1: Any Witness

- The judge can ask questions to any witness to ascertain the truth of the matter under inquiry.

- Option 2: Any Party

- Judges are also empowered to question any party involved in the proceedings for clarification.

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

- Both witnesses and parties can be questioned under this provision, aligning with the inclusive scope of Section 165.

- Option 4: Neither (a) nor (b)

- Incorrect as it contradicts the provision’s scope.