On which day of the week did Sohan visit Chennai ?
a: Sohan returned to Hyderabad from Chennai on Thursday
b: Sohan left Hyderabad on Monday for Chennai.

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

If the data in statement II alone are sufficient to answer the question, while the 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.