When Is a Commitment Fee Required of the Borrower by a Lending

When is a commitment fee required of the borrower by a lending institution?

A) When using a revolving credit agreement in which the bank holds an open line of credit for a borrower
B) When issuing commercial paper
C) A commitment fee is never required because it is illegal for lending institutions to charge a commitment fee
D) When using collateral to secure a bank loan
E) When using trade credit