Which of the following statements about the capital asset pricing model $($CAPM$),$ which is the $$father$$ of the security market line $($SML$),$ is most correct?

Group of answer choices

The CAPM is based on a restrictive set of assumptions

It has not been empirically verified.

In general, its inputs are difficult to estimate, particularly the expected dividend growth rate, E$($g$).$

In spite of its deficiencies, it provides investors with a rational way of thinking about required rates of return.

All of these statements are correct.