In which of the following conditions, the Vice-President of India can act as the President or discharge the functions of the President?
1. When the President resigns from his/her post.
2. When there is a delay in conducting the election of new President.
3. When the post becomes vacant due to death of the President.
4. When the President is unable to discharge his functions due to absence or illness.
Select the correct answer using the code given below: