If r and s are integers, is r devisable by 7? The product rs is devisable by s is not devisable by
A If statement 1 alone is sufficient to answer the question, but statement 2 alone is not sufficient
B If statement 2 alone is sufficient to answer the question, but statement 1 alone is not sufficient
C If both statements together are needed to answer the question, but neither statement alone is sufficient
D If either statement by itself is sufficient to answer the question