Consider the following statements regarding recent SEBI norms for futures and options (F&O) trading:

1. The contract size for index derivatives has been increased from ₹5-10 lakh to ₹15-20 lakh, effective from November 20, 2024.
2. Intraday monitoring of position limits will begin from April 1, 2025, where brokers' positions will be checked four times daily.
3. Upfront collection of option premiums from buyers is mandatory starting July 1, 2025.

Which of the statements given above is/are correct?