Which of the following statements about cash management systems is correct?

A. There are few actions a firm can take to improve its synchronization of cash flows.

B. A firm that has many divisions that are widely dispersed geographically will find that centralizing customers' payments is of little benefit.

C. A lockbox system generally is used to effectively manage a firm's collections through concentration banking arrangements.

D. Zero-balance accounts are used to help a firm to manage its cash receipts.

E. Disbursement float refers to the frequency with which a firm writes checks to pay its creditors.