Which statement is enough to give the answer of question.

Among M, N, T, R and D each having different age, who is the yongest ?

Statements-
I. N is younger than only D among them.
II. T is older than R and younger than M

1. If the data in both the statements I and II together are necessary to answer the question.
2. If the data in statement I alone is sufficient to answer the question, while the data in statement II alone is not sufficient to answer the question
3. If the data in statement II alone Is sufficient to answer the quesbon, while the data in statement I alone is not sufficient to answer the question
4. If the data either in statement I alone or in statement II alone is sufficient to answer the question