Which of the following statements about REITs is true?

A Like C-corporations, REITs pay federal tax on the dividends paid to shareholders, who then also pay dividend taxes

B At least 10% of a REIT's income must be earned from interest income on mortgage-backed securities investments

C REITS are not officially "investment companies" so they are not subject to the SEC investment company rules

D REITs must trade on major stock exchanges