Based on the capital asset pricing model $($CAPM$),$ which one of the following must increase the expected return on an individual security, all else held constant?

Group of answer choices

A decrease in the market rate of return given a security beta of $1\mathrm{.}13$

A decrease in the risk$-$free rate given a security beta of $1\mathrm{.}06$

A decrease in the market rate of return given a security beta of $\mathrm{.}78$

An increase in the risk$-$free rate given a security beta of $1\mathrm{.}42$

An increase in the risk level of that security as measured by standard deviation