The correct answer is option 2: 5 years. The term of office of the Vice-President of India is 5 years.
Option 1: 4 years - This is incorrect, as the term of office is not 4 years.
Option 3: 2 years - This is incorrect, as the term of office is not 2 years.
Option 4: 6 years - This is incorrect, as the term of office is not 6 years.
The Vice-President of India is elected by an Electoral College consisting of members of both houses of Parliament. The Vice-President can be re-elected for any number of terms, as long as they fulfill the eligibility criteria and are elected by the members of the Electoral College.