Which of the Following Statements Is True About Activities Allowed

Which of the following statements is true about activities allowed in connection with a public offering?

A) Generally,the waiting period is 20 days.
B) During the pre-filing period,the issuer may "condition the market."
C) During the waiting period,the issuer may sell and deliver securities,as long as a prospectus is provided to the investor.
D) After the registration statement is effective,the issuer may sell and deliver securities without giving the investor a prospectus.
E) A prospectus only need be delivered when the sale is closed.