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C is corrent. A corporation whose stock is listed on a national stock exchange is regulated under the provisions of the Securities Exchange Act of 1934. Under the 1934 Act, one of the sanctions available to the SEC is the revocation or suspension of the registration of the securities of any registrant.
A is incorrect. The Form 10-K must be filed with the SEC each year, regardless of whether the corporation has made a public offering during that year.
B is incorrect. The Form 10-K is not required to be distributed to the shareholders but must only be filed with the SEC.
D is incorrect. The corporation may still make private placement offerings, even though it has made a public offering.