Which of the Following Statements Is True of the Various

Which of the following statements is true of the various activities occurring during the registration process of securities in a sale?

A) A registration becomes ineffective and invalid immediately at the expiry of the waiting period.
B) Contracts to buy and sell securities are finalized during the posteffective period.
C) It becomes legal to sell a security subject to the act during the waiting period.
D) During the prefiling period, offers to sell and buy securities are permitted as per the Securities Act of 1933.
E) Tombstone ads are made after the end of the posteffective period.