3設u(t), v(t), w(t) 為三向量函數，則下列何者錯誤？ (A)(cv(t))′ = cv′(t) （c 為一常數） (B)(u(t) + v(t))′ = u′(t) + v′(t) (C)(u(t) • v(t))′ = u′(t) • v(t) + v′(t) •u(t) (D)(u(t)× v(t))′ = u′(t)× v(t) + v′(t)×u(t)