以下能对二维数组a进行正确初始化的语句是( )
int a[2][ ]={{1,0,1},{5,2,3}};
int a[2][4]={{1,2,3},{4,5},{6}};
int a[ ][3]={{1,2,3},{4,5,6}};
int a[ ][ ]={{1,0,1},{},{1,1}};