Concept:An overdraft is a banking facility that allows a current account holder to withdraw more money than the available balance in the account.
Explanation:A standing order is a fixed instruction to pay a set amount regularly, which does not permit withdrawing beyond one’s balance.
A loan is a separate sum borrowed for a specific purpose and is not directly linked to the current account balance.
A credit transfer involves moving money from one account to another, not withdrawing excess funds.
An overdraft specifically lets the account holder go beyond the existing account balance up to an approved limit.
Therefore, a customer wishing to withdraw an amount greater than the balance would apply for an overdraft facility.
Answer:B. an overdraft