A semi$-$annual$-$pay bond with a par value of R$1,000$ is callable in $5$ years at R$1,080.$ The bond has an $8\%$ coupon and $10$ years to maturity. If the current yield to maturity is $9\mathrm{.}6\%,$ the yield to call is closest to:

a$.$

$11\mathrm{.}97\%.$

b$.$

$9\mathrm{.}29\%.$

c$.$

$10\mathrm{.}67\%.$

d$.$

$12\mathrm{.}67\%.$