What is the greatest common divisor of numbers a and b ?
I. The least common multiple of a and b is ab.
II. a + b = 15.

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.