Dyl Inc.$\text{'}$s bonds currently sell for $$860$ and have a par value of $$1,000.$ They pay a $$55$ annual coupon and have a $20-$year maturity, but they can be called in $5$ years at $$1,080.$ What is their yield to

maturity $($YTM$)?$

a$.4\mathrm{.}56\%$

b$.7\mathrm{.}25\%$

c$.6\mathrm{.}80\%$

d$.6\mathrm{.}40\%$

e$.6\mathrm{.}84\%$