Integral Corp., with assets of $4 million, has issued common and preferred stock and has 350 shareholders. Its stock is sold on the New York Stock Exchange. Under the Securities Exchange Act of 1934, Integral must be registered with the SEC because

a. its shares are listed on a national stock exchange.

b. it has more than 300 shareholders.

c. its shares are traded in interstate commerce.

d. it issues both common and preferred stock.