The minimum age requirement to become a member of the Rajya Sabha, which is the upper house of the Indian Parliament, is 30 years. This means that individuals who are 30 years old or above are eligible to be elected as a member of the Rajya Sabha.
Option 1, 25 years, is incorrect as it does not meet the minimum age requirement for membership in the Rajya Sabha. Option 2, 21 years, is also incorrect as it falls below the minimum age requirement. Option 4, 35 years, is also incorrect as it exceeds the minimum age requirement.
Therefore, the correct minimum age for a member of the Rajya Sabha is 30 years.