\textbf{125.} In triangle $ABC$, the angle bisectors are internal and intersect at point $O$. If the angles $AOB$, $BOC$, and $COA$ are proportional to the numbers $7$, $6$, and $5$, the largest angle of this triangle is how many degrees?
\hspace{2cm} (1) $80^\circ$ \hspace{2cm} (2) $90^\circ$ \hspace{2cm} (3) $100^\circ$ \hspace{2cm} (4) $110^\circ$