下面代码的输出结果是： a = 123456789 b = "*" print("{0:{2}>{1},}\n{0:{2}^{1},}\n{0:{2}<{1},}".format(a,20,b))
选项：

A:****123,456,789*****
*********123,456,789
123,456,789*********
B:*********123,456,789
123,456,789*********
****123,456,789*****
C:****123,456,789*****
123,456,789*********
*********123,456,789
D:*********123,456,789
****123,456,789*****
123,456,789*********