Who among P, Q and R is the shortest ?
I. R is taller than P
II. Q is taller than P.

if the data either in statement I or in statement II alone are sufficient to answer the question.

if the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.

if the data even in both statements I and II together are not sufficient to answer the question.

if the data in both statements I and II together are necessary to answer the question.