DEF Ltd$\text{'}$s bonds are selling today at a $$56\mathrm{.}90$ discount based on a face value of $$1,000.$ They have a $6\mathrm{.}20\%$ coupon rate, pay semi$-$annual coupons and will mature in $8$ years. If DEF were to issue similar bonds today, what will be its coupon rate if they are sold at par and mature in $8$ years?

a$.6\mathrm{.}20\%$

b$.3\mathrm{.}57\%$

c$.7\mathrm{.}15\%$

d$.8\mathrm{.}58\%$

e$.8\mathrm{.}15\%$