For two sets A and B, what is $$n(A \cap B)$$?
I. $$n(A) = 10$$ and $$n(B - A) = 9$$
II. $$n(A - B) = 7, n(B - A) = 9$$ and $$n(A \cup B) = 19$$

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 statements aloneis sufficient.

D

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