Which One of the Following Statements Is NOT True

Which one of the following statements is NOT true?

A) Accounts payable (trade credit) , bank loans, and commercial paper are common sources of short-term financing.
B) An informal line of credit is a verbal agreement between the firm and the bank, allowing the firm to borrow up to an agreed-upon upper limit.
C) An informal line of credit is also known as "revolving credit."
D) A formal line of credit is also known as "revolving credit."