Indian Polity · Polity

With reference to the constitutional provisions regarding the Vice-President of India, consider the following statements: I. The Vice-President may resign from office by writing under his hand addressed to the President of India. II. A Vice-President elected to fill a casual vacancy holds office for the full term of five years from the date he enters office. III. The Vice-President continues to hold office, notwithstanding the expiration of his term, until his successor enters upon his office. IV. The electoral college for the Vice-President includes both elected and nominated members of both Houses of Parliament. Which of the statements given above are correct?