This topic mainly investigates the ways of short-term financing.

Under normal circumstances, borrowing enterprises can use collection method, discount method and interest rate increase method to pay bank loan interest.

Item A: Discount method is an interest-bearing method in which the bank deducts interest from the principal when granting loans to enterprises, and the borrowing enterprise needs to repay all the loan principal at maturity. Therefore, item A is correct.

Item BC: Collection method, also called debt service method, is a method of paying interest to the bank when the loan is due. So item BC is wrong.

Item D: Compensatory balance is a credit condition for banks to issue short-term loans, not a way for enterprises to pay loan interest. Therefore, item D is wrong.

To sum up, the correct answer to this question is item A.