The correct answer is: A. Cash on delivery
Cash on delivery (COD) is a payment method where the buyer pays for the goods or services in cash to the delivery person upon delivery. It is an offline payment mode because it does not involve the use of any electronic payment methods such as credit cards or bank transfers.
Cash before delivery (CBD) is another offline payment method where the buyer pays for the goods or services in cash to the seller before the goods are delivered. It is similar to COD, but the buyer pays the seller directly instead of the delivery person.
Credit card is an online payment method where the buyer uses a credit card to pay for the goods or services. The credit card information is transmitted electronically to the merchant’s bank, which authorizes the transaction and debits the buyer’s credit card account.
Therefore, the only offline payment mode is COD.