Which of the Following Best Defines the Term Firm Commitment

Which of the following best defines the term firm commitment underwriting?

A) The date on which existing shareholders on company records are designated as the recipients of stock rights. Also the date of record.
B) An issue of securities offered for sale to the general public on a cash basis.
C) Underwriter buys the entire issue, assuming full financial responsibility for any unsold shares.
D) Period when stock is selling without a recently declared right, normally beginning two business days before the holder-of-record date.
E) The type of underwriting in which the offer price is set based on competitive bidding by investors. Also known as a uniform price auction.