Which of the Following Is True Concerning Transfer Mechanisms

Which of the following is true concerning transfer mechanisms?

A) The firm must choose the mechanism that offers the highest earnings on the increased funds' availability.
B) The firm must choose the mechanism that offers the lowest costs.
C) The firm must balance the marginal costs vs. the marginal benefits and select the one with the highest marginal profit.
D) In practice, most companies use wire transfers for large transfers of funds from lockbox systems and EDTs for high-volume, low-dollar transfers from small deposit banks.
E) Both (c) and (d) are true.