^Stacks
~Given the following stack operations...

    push (24)
    push (28)
    push (29)
    pop  (x)
    push (30)
    push (32)
    pop  (y)
    pop  (z)
    pop  (z)

... what are the contents of x,y and z, after the operations have been
performed?

a.  x = 29, y = 32, z = 28
b.  x = 32, y = 29, z = 30
c.  x = 24, y = 30, z = 29
d.  x = 30, y = 28, z = 24
e.  x = 28, y = 24, z = 32