Is $$R_1$$ an equivalence relation?
I. $$R_1$$ is a relation on real numbers, R, defined by $$(a, b) \in R_1 \Leftrightarrow 2 + ab > 0$$ for all $$a, b \in R$$
II. $$R_1$$ is a symmetric relation.

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 the statements I and II together 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.