An assembly line consists of three workstations $($WS$)$ with each station's activity time as shown.

WS $2$

$3$ minutes

WS $3$

$4$ minutes

WS $1$

$5$ minutes

When fully operational the maximum output for this line in $8$ hours of production time would be

$160$ units.

$40$ units.

$120$ units.

$96$ units.