Which one of the following is the computation ofthe risk premium for an individual security? E$($r$)$ isthe expected return on the security, if is the risk$-$free rate, I is the security$\text{'}$s beta, and E$($r$)$M is theexpected rate of return on the market.a$.$ E$($r$)-$ E$($r$)$MOb$.$ E$($r$)-($E$($r$)$M $+$ rf$)$CC$.$ E$($r$)$M $-$ rfOd.d$.$ BLE$(+)$M $-$ rE$]$