Which one of the following best describes the term merchant discount rate, sometimes in news?

• A. It is an incentive given by a bank to a merchant to accept payment through the debit card of that bank.
• B. It is the amount refunded by banks to their customers for using debit cards for financial transactions to purchase goods and services.
• C. This is a fee levied by a bank on a merchant for taking payment from the debit card of its customers.
• D. This is an incentive given by the government to merchants to promote digital payments from their customers through Point of Sale (PoS) machines and debit cards.