কোন শর্তে $a_{1} x^{2}+b_{1} x+c_{1}=0$ এবং $a_{2} x^{2}+b_{2} x+c_{2}=0$ সমীকরণদ্বয়ের দুটি মূলই সাধারণ হবে?

$\frac{a_{1}}{b_{2}}=\frac{a_{2}}{b_{1}}=\frac{c_{1}}{c_{2}}$

$\frac{a_{1}}{a_{2}}=\frac{b_{1}}{b_{2}}=\frac{c_{1}}{c_{2}}$

$\frac{a_{1}}{a_{2}} \neq \frac{b_{1}}{b_{2}}=\frac{c_{1}}{c_{2}}$

$\frac{a_{1}}{a_{2}}=\frac{b_{1}}{b_{2}} \neq \frac{c_{1}}{c_{2}}$