Which One of the Following Statements Is True Concerning Collection

Which one of the following statements is true concerning collection float?

A) Cheques received by the firm create collection float.
B) Collection float is desirable because it means that the bank thinks the firm has more cash than it really does.
C) The benefits of reducing collection float are not particularly significant.
D) When collection float increases, net float decreases.
E) Collection float increases when a lockbox system is implemented.