$3)$ The expected return of a portfolio is $10\mathrm{.}3\%,$ and the risk$-$free rate is $5\%.$ If the portfolio standard deviation is $17\%,$ what is the reward$-$to$-$variability ratio of the portfolio?A$)0\mathrm{.}39$B$)0\mathrm{.}31)0\mathrm{.}65$D$)0\mathrm{.}69$