$7 \sin ^{2} \theta+3 \cos ^{2} \theta=4$ হলে, $\tan \theta$ এর মান হবে-

$\frac{1}{\sqrt{2}}$

$\pm \frac{1}{\sqrt{3}}$

$\pm \frac{1}{\sqrt{2}}$

$\pm \frac{2}{\sqrt{3}}$