You are given a question and three statements. Identify which of the statements is/ are necessary sufficient to answer the question:

Question:

In which year was Arti born?

Statements:

I. Aarti is six year older than Pranavi

II. Pranavi’s sister was born in 1982

III. Aarti’s sister is two years younger than Pranavi’s sister, who is eight years younger than Pranavi.