Explanation:

- Option 1: On payment of fine.

- Imprisonment can end if the fine is fully paid because the reason for imprisonment was non-payment.

- Option 2: On expiry of the term of imprisonment for non-payment.

- If the full term of imprisonment specified for non-payment is served, it ends even if the fine remains unpaid.

- Option 3: Both (a) and (b).

- This implies that either paying the fine or completing the imprisonment term can stop the imprisonment.

- Option 4: None.

- This asserts that neither paying the fine nor serving the term ends the imprisonment, which seems incorrect.

Correct Answer: Option 3 (Both a and b)

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