A floating object is stable, when its

$($a$)$ center of mass is above its center of buoyancy. $($b$)$ center of buoyancy is below fluid surface.

$($c$)$ center of buoyancy is above its metacenter. $($d$)$ metacenter is above its center of buoyancy.

$($e$)$ metacenter is above its center of mass. $(2$ p$)$