$\begin{align*} \int_0^{\pi/2} \sin^8x \cos^2 x \;dx \end{align*}$ is equal to :

Question

( A ) $\frac{7 \pi}{512}$
( B ) $\frac{7 \pi}{512}$
( C ) $\frac{5 \pi}{512}$
( D ) $\frac{ 3 \pi}{512}$