Explanation:

- Change in Margin Requirements of Loanee: This is a quantitative or selective tool. By changing the margin requirements, the central bank controls the amount of loan banks can give against securities.

- Credit Rationing: This is a qualitative (selective) method. It restricts the quantity or type of credit for certain sectors or purposes.

- Direct Action: This is also a qualitative method where the central bank directly controls or guides banks’ lending policies, often by issuing directives.

- Option 4: All of these: Only some of these are qualitative, not all.

The correct answer is Option:2, Credit Rationing.