$\left(\frac{a}{x}+\frac{x}{a}\right)^{10}$ এর বিস্তৃতিতে মধ্য পদ কোনটি?

${ }^{10} \mathrm{C}_{5}$

${ }^{10} \mathrm{C}_{5}\left(\frac{a}{x}\right)^{5}$

${ }^{10} C_{5}\left(\frac{x}{a}\right)^{5}$

${ }^{10} C_{5}\left(\frac{a}{x}\right)$