Which of the Following Is Correct Regarding Green Shoe Provisions

Which of the following is correct regarding Green Shoe provisions?

A) They rarely exist in either debt or equity offerings.
B) They typically expire 30 days after the issue date.
C) They typically involve at least 115% of the newly-issued shares.
D) They are a benefit to the firm and a cost to the underwriting syndicate.
E) They allow the lead underwriter to purchase additional shares at the offer price, but the remaining members of the syndicate must pay the going market price.