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 stock portfolio? O AV=f(ARf, AMANAB) O AV=f(AMKT, AMANAB) O AV= f(AR, ARP, AMANAB) O AV=f(AR, ARP) Research on pension portfolio performance suggests that managed pension portfolios perform market indexes. During the credit crisis, some pension portfolios performed benchmark market indexes because their managers invested heavily in risky mortgages and mortgage-backed securities. 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 stock portfolio? O AV=f(ARf, AMANAB) O AV=f(AMKT, AMANAB) O AV= f(AR, ARP, AMANAB) O AV=f(AR, ARP) Research on pension portfolio performance suggests that managed pension portfolios perform market indexes. During the credit crisis, some pension portfolios performed benchmark market indexes because their managers invested heavily in risky mortgages and mortgage-backed securities