Which of the Following Is True for a System at Equilibrium

Which of the following is true for a system at equilibrium?

A) ( $\Delta$ S°_sys = $\Delta$ S°_surr)
B) ( $\Delta$ S°_sys = - $\Delta$ S°_surr)
C) ( $\Delta$ S°_sys = $\Delta$ S°_surr = 0)
D) ( $\Delta$ S°_univ > 0)
E) (None of these is a sufficient condition.