$310.$ A bond has a coupon rate of $4,7\%,$ a $$1,000$ par value, matures in $8\mathrm{.}6$ years, has a yield to maturity of $5\mathrm{.}4\%$ and pays interest annually. What is its current yield?

b$.486\%$

c$\mathrm{.}4\mathrm{.}93\%$

d$.5\mathrm{.}08\%$

$2\mathrm{.}4\mathrm{.}75\%$