If the positive real numbers a, b, c, d are in Geometric Progression, what is the common ratio of that Geometric Progression?
I) $$\frac{ad}{bc}= 1$$
II) $$\frac{ac}{bd}= 9$$

A

if the statement I alone is sufficient to answer the question.

B

if the statement II alone is sufficient to answer the question.

C

if both the statements I and II are sufficient to answer the question but neither statement alone is sufficient.

D

if both the statements I and II together are not sufficient to answer the question and additional data is required.