19. 如下圖電路所示,此邏輯電路之輸出 f(A,B, C,D)為何?(A)Σ(0,1,3,4,10,11,12,13 )(B)Σ (0,1,3,4,8,9,14)(C)Σ(2,5,6,7,8,9,14 )(D)Σ(2,5,6,7,10,11,12,13 )。