Which table correctly matches the credit ratings with their corresponding Yield to Maturity $($YTM$)$ values?"

A$.)$ Rating AAA AA A BBB BB

YTM $6\mathrm{.}70\%6\mathrm{.}80\%7\mathrm{.}00\%7\mathrm{.}40\%8\mathrm{.}00\%$

B$.)$ Rating A AA AAA BB BBB

YTM $6\mathrm{.}70\%6\mathrm{.}80\%7\mathrm{.}00\%7\mathrm{.}40\%8\mathrm{.}00\%$

C$.)$ Rating BBB BB AAA AA A

YTM $6\mathrm{.}70\%6\mathrm{.}80\%7\mathrm{.}00\%7\mathrm{.}40\%8\mathrm{.}00\%$

D$.)$ Rating BB BBB A AA AAA

YTM $6\mathrm{.}70\%6\mathrm{.}80\%7\mathrm{.}00\%7\mathrm{.}40\%8\mathrm{.}00\%$