What will be Suraj’s age after eight years?

I. The ratio between Kamya’s and Suraj’s present age is 4 : 7 respectively.

II. Kamya is 15 years younger than Suraj.

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

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

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