Stack A hasthe entries a, b, c (with a on top). Stack B is empty. An entry popped outof stack A can be printed immediately or pushedto stack B. An entry popped out of the stack B can only be printed. In this arrangement, which of the following permutations of a, b, c are not possible?

A

b a c

B

b c a

C

c a b

D

a b c