If three positive numbers are inserted between 4 and 512 such that the resulting sequence is a G.P., which of the following is not among the numbers inserted?

If three positive numbers are inserted between 4 and 512 such that th

1.	If three positive numbers are inserted between 4 and 512 such that the resulting sequence is a G.P., which of the following is not among the numbers inserted?
A.	256
B.	16
C.	64
D.	128
Answer» E.