Statement 1 is Correct: While the Liquidity Adjustment Facility (LAF) is primarily used by Scheduled Commercial Banks, certain Non-Banking Financial Companies (NBFCs) that are registered as Primary Dealers (PDs) have direct access to the RBI's LAF window. Additionally, during periods of liquidity stress, the RBI has historically introduced special windows (such as the Special Liquidity Facility) that allow funds to be channeled to NBFCs, justifying the statement that they can access this facility.

Statement 2 is Correct: Foreign Institutional Investors (FIIs), now categorized under the Foreign Portfolio Investor (FPI) framework, are permitted to invest in and hold Government Securities (G-Secs) and Treasury Bills. The RBI and SEBI regulate these investments through specific caps and routes like the Fully Accessible Route (FAR).

Statement 3 is Correct: Stock exchanges in India, such as the National Stock Exchange (NSE) and Bombay Stock Exchange (BSE), provide dedicated trading platforms for debt instruments. These include segments like the Wholesale Debt Market (WDM) and the Retail Debt Market (RDM), which facilitate the trading of government securities and corporate bonds.