下列程序段的执行结果是Dim A(3,3)For M = 1 To 3For N = 1 To 3If N = M Or N = 3 - M + 1 ThenA(M,N) = 1Else A(M,N) = 0 End IfNext NNext MFor M = 1 To 3For N = 1 To 3Print A(M,N)Next NPrint Next MA. 1 0 0 0 1 0 0 0 1 B. 1 1 1 1 1 1 1 1 1C. 0 0 0 0 0 0 0 0 0 D. 1 0 1 0 1 0 1 0 1