The Capital Asset Pricing Model $($CAPM$)$ includes which of the following in its base assumptions?

Investors should earn a minimum return equal to the risk$-$free rate.

II$.$ Investors in the market should earn a return greater than the return on the overall market.

III. Investors should be rewarded for the amount of risk they assume.

IV$.$ Investors should diversify their portfolio.

$1,$ II and III only

I and III only

II and IV ooly

$1,$ III and IV only