单项选择题有以下程序:#include <stdio.h>#define N 4void fun(int a[][N]){ int b[N][N],i,j;for(i=0; i<N; i++)for(j=0; j<N; j++)b[i][j]=a[N-1-j][i];for(i=0; i<N; i++)for(j=0; j<N; j++)a[i][j] = b[i][j];}main(){ int x[N][N]={{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}},i;fun(x); fun(x);for(i=0; i<N; i++)printf( %d, ,x[i][i]);printf( n );}程序的运行结果是______。
A.16,11,6,1,
B.1,6,11,16,
C.4,7,10,13,
D.13,10,7,4,