Final answer:
The correct answer is D. All of the above, as online consumers can use Electronic cash, Credit/debit cards, and Electronic checks as methods of payment.
Step-by-step explanation:
The method(s) of payment for online consumers include Electronic cash, Credit/debit cards, and Electronic checks. Hence, the correct answer is D. All of the above.
Debit Cards allow a holder to transfer money electronically from their bank account to the seller immediately upon making a purchase. Unlike debit cards, Credit Cards are considered a short term loan from the credit card company to the consumer until the bill is paid. Lastly, smart cards enable storage of a monetary value for transactions, but may be limited to specific uses or locations. Having more credit or debit cards does not increase the actual quantity of money in the economy.