Answer:
Overdraft protection as it is used in how to make the most of your debit card is a service that allows you to make a purchase even if you do not have enough money in your account. (C)
Explanation:
This is to ensure that the bank account holder does not loses all their money in any adverse situation and as a result does not face any major consequences. This also helps the bank in restraining from extra burden from the side of customer.
When you signed up for getting the "Overdraft protection", the bank which you applied for will use a linked backup source that you already have i.e., credit card, a line of credit or the savings account, in order to pay whenever the account lacks the funds needed for transaction. It actually prevents your "checking account" from overdrafting.