Option 1: 25 years -> This is the minimum age required to be a member of the Lok Sabha (House of the People).
Option 2: 30 years -> This is the minimum age required to be a member of the Rajya Sabha (Council of States).
Option 3: 18 years -> This is the minimum age for voting rights in India.
Option 4: 35 years -> This is the minimum age required to be eligible for the office of Vice-President of India.
Hence, Option 4: 35 years -> As per Article 66 of the Indian Constitution, the qualifications for Vice-President are similar to those of the President, which includes completing the age of 35 years, being a citizen of India, and being qualified for election as a member of the Rajya Sabha -> correct