Which of the following is De-Morgan’s law?

• A. P ∧ (Q v R) Ξ (P ∧ Q) v (P ∧ R)
• B. ~(P ∧ R) Ξ ~P v ~R, ~(P v R) Ξ ~P ∧ ~R
• C. P v ~P Ξ True, P ∧ ~P Ξ False
• D. None of the mentioned