Explanation:

- Option 1: Naib Tehsildar

- They are responsible for revenue collection and administration at the sub-tehsil level.

- Naib Tehsildar acts as the officer in charge of various revenue matters.

- Option 2: Sub-judge

- Mainly involved in judicial matters, dealing with civil cases rather than revenue administration.

- They function under the district judiciary system.

- Option 3: Third class magistrate

- Primarily deals with small-time criminal cases and judicial matters.

- They do not handle revenue issues.

- Option 4: Munsif

- Deals with civil disputes involving small financial amounts.

- Not directly related to handling revenue matters.

- Correct Answer: Option 1: Naib Tehsildar

- They are considered the lowest court of revenue.