Pension funds commonly maintain a portfolio of stocks as well as a portfolio of bonds. Let MKT represent general stock market conditions and MANAB represent the abilities of the pension fund's management, while Rf represents the risk-free rate and RP represents the risk premium. What is the best way to model the change in the value of a pension fund's bond portfolio? V=f(Rf,RP)V=f(Rf,MANAB)V=f(MKT,MANAB)V=f(Rf,RP,MANAB) Consider an actively managed pension fund that has a bond portfolio. The fund's performance can be evaluated by comparing its return to which of the following? A most aggressive investment plan A benchmark bond index A most conservative investment plan An exchange-traded fund representing the stock index