Question $9$

Not yet answered Marked out of $2\mathrm{.}00$

For the system shown below, where $s(t)=m(t)cos(Wct)$ and $fm$ is the bandwidth of the message $m(t)$ in $Hz,$ then the ESD of the $m(t)$ at $W=0$ is:

a$.M(0{)}^2$

b$.2M(0)$

c$.M(0)$

d$.$ infinity