Explanation:

- Option 1: Cabinet Minister of Parliamentary Affairs

- This minister manages the schedule and business of the Parliament, but does *not* preside over sessions.

- Option 2: Lok Sabha Speaker

- Correct Answer. The Speaker of the Lok Sabha presides over a joint session of Parliament, as per Article 118 of the Constitution.

- Option 3: Rajya Sabha Deputy Chairman

- The Deputy Chairman of Rajya Sabha only presides in the absence of Rajya Sabha Chairman, not in a joint session (unless both Speaker and Deputy Speaker are absent).

- Option 4: Rajya Sabha Chairman

- The Chairman (Vice President of India) presides over Rajya Sabha, but does not preside over a joint session.