下面代码的输出结果是list1 = [(m,n) for m in 'ABC' for n in 'ABC' if m!=n]print(list1)

A、[('A', 'C'), ('A', 'D'), ('B', 'C'), ('B', 'D')];
B、[('A', 'B'), ('A', 'C'), ('B', 'A'), ('B', 'C'), ('C', 'A'), ('C', 'B')];
C、错误;
D、['AC', 'AD', 'BC', 'BD']