21. From the time a receipt for a preliminary prospectus is obtained, and until a receipt for the prospectus in its final version is obtained, it is permissible, notwithstanding sections 11, 12 and 16,
(1) to forward a preliminary prospectus to any person;
(2) to distribute an advertising document not prohibited by regulation, provided it adequately reflects the information presented in the preliminary prospectus, without distorting it by selective presentation or by adding misleading statements;
(3) to solicit prospective subscribers or purchasers without accepting any undertaking on their part.