执行下面Python代码后,输出的结果是?( )
1 t1 = (1, 2, 3, 4, 5, 6, 7)
2 t2 = ('a', 'b', 'c', 'd', 'e', 'f')
3 s = t1[2:] + t2[5:2:-1]
4 print(s)
A.
(3, 4, 5, 6, 7, 'c', 'd', 'e')
B.
(3, 4, 5, 6, 7, 'f', 'e', 'd', 'c')
C.
(3, 4, 5, 6, 'f', 'e', 'd', 'c')
D.
(3, 4, 5, 6, 7, 'f', 'e', 'd')