Three forces, $5\mathrm{.}0$ N$,15\mathrm{.}0$ N$,$ and $20\mathrm{.}0$ N$,$ are acting on a $9\mathrm{.}81$ kg object. Which of the following forces could also be acting on the object if it is moving with constant velocity?

$19\mathrm{.}0$ N

$39\mathrm{.}0$ N

$1\mathrm{.}0$N

Any of these