Three statements I, II and III given below the question. You have to decide whether the data given in the statements is sufficient to answer the question. Read all the statements carefully and find which of the statements are sufficient to answer the given question. Choose the correct alternative in this question.

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Who among Siddhartha, Nikunj, Vipul and Mukul is the youngest ?  

I. Vipul is younger than Mukul but older than Siddhartha and Nikunj. 
II. Mukul is the oldest. 
III. Siddhartha is older than Nikunj.