Let $x(t)=10 \cos (10.5 W t)$ be passed through an LTI system having impulse response $h(t)=\pi\left(\frac{\sin W t}{\pi t}\right)^{2} \cos 10 Wt$. The output of the system is
- $\left(\frac{15 W}{4}\right) \cos (10.5 W t)$
- $\left(\frac{15 W}{2}\right) \cos (10.5 W t)$
- $\left(\frac{15 W}{8}\right) \cos (10.5 W t)$
- $(15 W) \cos (10.5 W t)$