The correct answer is option 3, which states that the duration of membership of State Legislative Councils is 6 years. This means that once elected to the State Legislative Council, a member serves for a total of 6 years before their term ends. It is important to note that the State Legislative Council is the upper house of the State Legislature, and its members are not directly elected by the public, unlike the State Legislative Assembly. The members of the Legislative Council are elected by members of local bodies, graduates, teachers, and other special interest groups. It is worth mentioning that the duration of membership may vary slightly among different State Legislative Councils, but the general standard is 6 years.