Correct option is D
The Reserve Bank of India has not issued any mandate on the ink colour to be used while writing cheques. However, banks generally recommend blue or black ink since they provide better clarity when scanned under the Cheque Truncation System (CTS).
Knowledge Booster:
Using blue/black ink is a best practice suggested by banks for preventing fraud and ensuring legibility.
Other colours (red, green) may not scan well in CTS, which could lead to processing delays.