The correct answer is option 3, which states that the maximum strength of Rajya Sabha is 250. The Rajya Sabha is the upper house of the Indian Parliament and its maximum strength is determined by the Constitution of India.

To understand this, we need to look at Article 80 of the Constitution. According to this article, the Council of States, which is the Rajya Sabha, is composed of members chosen by the elected members of the State Legislative Assemblies. The total number of members of the Rajya Sabha should not exceed 250.

It is important to note that the actual strength of the Rajya Sabha at any given time may be less than the maximum limit if some seats are vacant. The number of members from each state is determined based on the population of the state and other factors.

So, the correct maximum strength of Rajya Sabha is 250.