Final answer:
Non-sufficient funds (NSF) occurs when a customer tries to make a payment or withdrawal, but they do not have enough money in their account to cover the transaction. In these cases, the bank may charge a fee to the customer for the failed transaction.
Step-by-step explanation:
The correct answer is A) Non-sufficient funds.
Non-sufficient funds (NSF) occurs when a customer tries to make a payment or withdrawal, but they do not have enough money in their account to cover the transaction. In these cases, the bank may charge a fee to the customer for the failed transaction. This fee is known as an overdraft fee or insufficient funds fee, and it is passed on to the customer.