Consider the following airports:

1. Donyi Polo Airport
2. Kushinagar International Airport
3. Vijayawada International Airport

In the recent past, which of the above have been constructed as Greenfield projects?

* Donyi Polo Airport (Itanagar, Arunachal Pradesh): This newly constructed airport was inaugurated in 2022. It was built on undeveloped land, making it a greenfield project. * Kushinagar International Airport (Uttar Pradesh): This airport was inaugurated in 2021. It was also built as a new entity on undeveloped land, qualifying as a greenfield project. * Vijayawada International Airport (Andhra Pradesh): This airport has existed for several decades. While it has undergone significant expansion and modernization, it wasn't built from scratch on undeveloped land. Therefore, it's not a greenfield project. Therefore, only Donyi Polo Airport and Kushinagar International Airport are greenfield projects.