Bonds A, B, and C are in a portfolio currently valued at $1,000,000. $300,o00 are invested in bond A, $300,o00 are invested in bond B, and the remainder is invested in bond C. Bond A has a duration of 2 years, bond B has a duration of 1.7 years, and bond C has a duration of 2.5 years. What is the duration of the portfolio of bonds? O a. 2.31 years O b. 2.11 years O c. 2.28 years O d.2.03 years O e. None of these choices are correct