Sơ đồ suy luận nào đúng? A. {[(a → b) ∧ (c → d)] ∧ (b ∨ d)} ⇒ (a ∨ c). B. {[(a → ~b) ∧ (c →

{[(a → b) ∧ (c → d)] ∧ (b ∨ d)} ⇒ (a ∨ c).

{[(a → ~b) ∧ (c → ~d)] ∧ (b ∨ d)} ⇒ ~(a ∧ c).

{[(a → b) ∧ (c → d)] ∧ (~b ∨ ~d)} ⇒ (a ∨ c).

{[(a → b) ∧ (c → d)] ∧ (~b ∨ ~d)} ⇒ ~(a ∨ c).