Explanation:

- Open Market Operations (Option 1): This involves buying or selling government securities. It's a quantitative tool that impacts the money supply and credit availability.

- SLR Variation (Option 2): The Statutory Liquidity Ratio is a set percentage of deposits that banks must maintain in liquid form. Altering the SLR directly affects credit flow and is a quantitative tool.

- Bank Rate (Option 3): This is the rate at which the central bank lends to commercial banks. It influences interest rates across the banking system, making it a quantitative measure.

- Loan to Value Ratio (Option 4): This is a ratio of a loan to the value of an asset purchased. It is generally used to manage risk for individual loans and not a broad quantitative measure.