An object suspended from a spring scale is lowered into a bucket filled to the brim with water, and $4$ N of water overflows. The scale shows that the object weighs $6$ N in the water. The buoyant force on the object is

$($a$)2$ N

$($b$)4$ N

$($c$)6$ N

$($d$)10$ N

$($e$)$ Impossible to determine since the mass of the object is not given.