Given that moving your finger $3\mathrm{.}5cm$ on a trackpad results in the mouse cursor moving $4\mathrm{.}5cm$ on the display, what is the Control$-$Display $($CD$)$ gain of this interaction?

$0\mathrm{.}77$

$1\mathrm{.}00$

$1\mathrm{.}28$

$8\mathrm{.}00$