For real numbers a and b, what is the value of 7a + 4b?
I. $$ab \neq 0$$
II. $$a^2 + b^2 = 0$$

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.