Explanation:

- Credit Multiplier refers to the concept in banking where the initial deposit can lead to a much larger amount of final deposit due to the reserve requirements.

- Option 1: 1CRR - This suggests that the multiplier is the reciprocal of the Cash Reserve Ratio (CRR).

- Option 2: Cash x 1 CRR - This expression likely means multiplying cash reserves by the unit CRR, which is not a valid calculation for the credit multiplier.

- Option 3: Cash x CRR - This implies multiplying cash by CRR, which also doesn't reflect the multiplier's calculation.

- Option 4: None of these - A default option if no other options correctly describe the multiplier.

Correct Answer: Option 1: 1CRR.