Which of the Following Is True

Which of the following is true?

A) The Securities and Exchange Commission (SEC) set margin requirements for stock purchases.
B) The current margin requirement is 50 percent although brokerage firms often set higher margin requirements and vary them based on the stocks being traded and the trading behavior of individual customers.
C) The Securities and Exchange Commission (SEC) makes margin loans to customers in amounts above the margin requirement.
D) All brokerage firms currently charge the same brokerage fees for executing transactions.