Answer : 4. "Retired Chief Justice of a High Court"
Explanation :

1. According to the Human Rights Protection Act 1993, which is an act passed by the Parliament, there is a provision to establish the National Human Rights Commission at the national level and a State Human Rights Commission at the state level.

2. The main objective of the Rajasthan State Human Rights Commission is to act as a monitoring body to protect human rights in the state.

3. According to the Human Rights Protection (Amendment) Act, 2006, a provision has been made for a Chairman and two members in the State Human Rights Commission.

4 At present the details of the Honorable Chairman and Honorable members of the Commission are as follows -

* Shri Gopal Krishna Vyas, Honorable Chairman

* Shri Ram Chandra Singh Jhala, Honorable Member

* Shri Mahesh Goyal, Honorable Member

5. The Chairman of the Rajasthan State Human Rights Commission is appointed by a retired Chief Justice of a High Court.