In processing cheques which of the following I/O techniques have banks traditionally followed?

OCR (Optical Character Recognition)
MICR (Magnetic Ink Character Recognition)
Barcode
VRT (Volume Rendering Technique) E. None of these

The correct answer is B. MICR (Magnetic Ink Character Recognition).

MICR is a technology that reads characters printed with magnetic ink. It is used in banking to process cheques. The MICR code is printed on the bottom of the cheque in a special font. It includes the cheque number, the bank routing number, and the account number. When a cheque is deposited, the MICR code is read by a machine and used to identify the cheque and route it to the correct bank.

OCR is a technology that reads characters printed on paper. It is used in many applications, such as scanning documents and converting them to text files. OCR can be used to process cheques, but it is not as accurate as MICR.

Barcodes are a type of optical code that can be read by machines. They are used in many applications, such as tracking inventory and shipping goods. Barcodes can be used to process cheques, but they are not as accurate as MICR.

VRT is a technology that is used to create three-dimensional images from data. It is not used in processing cheques.

Therefore, the correct answer is B. MICR (Magnetic Ink Character Recognition).