$\lim _{x \rightarrow 0}\left(\frac{3 x^{2}+2}{7 x^{2}+2}\right)^{\frac{1}{x^{2}}}$ is equal to
$\frac{1}{\mathrm{e}}$
$e^{2}$
e
$\frac{1}{\mathrm{e}^{2}}$
Correct Option: , 4
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