Which of these is a quantitative tool of monetary control?

1. Quantitative tools change the overall extent of money supply. 2. They are the CRR, the bank rate and **open market operations**. 3. Qualitative tools work by influencing the direction of lending instead. 4. Moral suasion and margin requirements are qualitative, so all three distractors sit on the other side of that split. _Source: syllabus Introductory Macroeconomics, Ch 3 "Money and Banking", section 3.4 POLICY TOOLS TO CONTROL MONEY SUPPLY_