How many different ways can be used to register at a internet website, using x, y, z and digits 1, 2, 3, 4, 5 can be used?
(A) 88 - 1
(B) (8/7)(88 - 1)
(C) 78 - 1
(D) (8/7)(78 - 1)
(E) 4(88 - 1)
