The sub-duplicate ratio of 16:64 is	Choose the correct choice from the following options:  A) 4:3  B) 1:2  C) 1:3  D) 1:4  E) 2:4
root(16):root(64)=4:8=2:4   ANSW2:4R:2:4
<result>E</result>
The sub-duplicate ratio of 16:64 is