which one is correct?

Question 10 (9 points) A firm commitment arrangement with an investment banker occurs when: A) Underwriter doesn't buy the issue, but promise to help the firm sell the stock at the best price. B) Underwriters assists the firm in all legal procedures (e.g., SEC registration, writing prospectus), and negotiates with potential investors during the road show. C) Underwriters are in compliance with federal laws enforced by the Securities and Exchange Commission (SEC) D) Underwriter pays a fixed price to buy the issue from the firm and then sells the stock to the public, hopefully, a higher amount