Consider the following statements with regard to the vice-President of India.
1. The vice-President is the ex-officio chairman of the RajyaSabha.
2. The vice-President discharges the duties of the President in case his office falls vacant due to death.
3. In the event of the death of the President, the vice-President assumes the responsibilities of the office of the President for the unexpired term.
4. In the event of the death of the President the vice-President acts as President for a maximum period of six months.
Of these statements