When Does a Waiting Period Begin

When does a waiting period begin?

A) When an issuer files a registration but is waiting to issue the prospectus
B) Once an issuer files a registration statement and prospectus
C) When the SEC is made aware that a company wants to issue stocks
D) It depends on the state statutes where the stock will be issued.
E) 30 days after a registration statement and prospectus are filed.