$y=\log _{x} a$ হলে, $\frac{d y}{d x}=\text {}$কত?

$-\frac{\log a}{x(\log x)^{2}}$

$-\frac{\ln a}{x(\ln x)^{2}}$

$\frac{\log a}{x(\log x)^{2}}$

$\frac{\ln a}{x(\ln x)^{2}}$