The APT $[$Arbitrage Pricing Theory$]$ model posits that the most significant factors influencing the required rate of return are:

Question $17$ options:

a$.$ Inflation and industrial$/$economic growth$$

b$.$ Inflation, industrial$/$economic growth, risk premiums, risk free rate and a random error term$$

c$.$ Inflation, industrial$/$economic growth and risk premiums$$

d$.$ Risk free rate, random error term, and risk premiums$$