$4-$year Treasury bonds yield $6\mathrm{.}20\%.$ The inflation premium $($IP$)$ is $4\mathrm{.}10\%,$ and the maturity risk premium $($MRP$)$ on $4-$year T$-$bonds is $0\mathrm{.}3\%.$ What is the real risksfres rate, r$*$A$.2\mathrm{.}00\%$b$.2\mathrm{.}10\%$ c$.4\mathrm{.}40\%$ d$.56\mathrm{.}35-4\mathrm{.}32-\mathrm{.}90\%$e$.1\mathrm{.}80\%$