There Are Two Types of Costs Borne by Investors in Mutual

There are two types of costs borne by investors in mutual funds: the first cost is the shareholder fee and the second cost is the annual fund operating expense. Which of the below descriptions relate to the second cost?

A) the expense ratio, which covers the fund's expenses and occurs on all funds
B) the "one-time" charge debited to the investor for a specific transaction
C) the charge based on the way the fund is sold or distributed
D) the charge that covers the purchase, redemption, or exchange.