Explanation:

- Option 1: President of India

- The President does not preside over the joint sitting. They only summon the joint sitting.

- Option 2: Speaker of Lok Sabha

- The Speaker of Lok Sabha presides over the joint sitting of Parliament, as per Article 118 of the Indian Constitution.

- Option 3: Chairman of Rajya Sabha

- The Chairman (Vice-President) does not preside over joint sittings. If the Speaker is absent, the Deputy Speaker presides, and if both are absent, then the Deputy Chairman of Rajya Sabha.

- Option 4: None of the above

- This is incorrect, since Speaker of Lok Sabha is the right answer.