Answer : 4. "Vijaypur"
Explanation :

GAIL (India) Limited inaugurated its first 10 MW green hydrogen plant in Vijaypur, Madhya Pradesh under the National Green Hydrogen Mission. The mission, approved on January 4, 2022, aims to make India a global hub for green hydrogen. It includes incentives for electrolyser manufacturing and green hydrogen production, support for pilot projects, development of green hydrogen hubs and policy framework for green hydrogen ecosystem and standards.