An investor has a $1,000,000 portfolio that is split evenly between "blue chip" stocks and Treasury securities. The current economic environment is characterized by low interest rates and flat stock prices - and this is expected to remain unchanged for a number of years. However, the residential and commercial real estate market is expected to be strong. The investor would like to diversify the portfolio and enhance returns without adding much additional risk. Which of the following investment purchase recommendations would help achieve this objective?A. Mortgage REITsB. Mortgage BondsC. Equity REITsD. Fannie Mae Pass-Through Certificates