Explanation:

Fourth option is correct.

Vistara, the joint venture carrier between Tata Sons and Singapore Airlines, has become the 3rd Indian carrier to be a member of the International Air Transport Association (IATA), a global body of 280 airlines. Air India and Jet Airways are the two other airlines in India that are IATA members.

The IATA membership will enable Vistara to collaborate with other international member airlines for codeshare and interline agreements, and provide a seamless travel experience through an extended global network to travellers to and from India. IATA represents airlines from over 120 countries.