Exp) Option c is the correct answer.

Option c is correct: The term “pumped-storage hydropower” relates to long-duration energy storage. It refers to a type of hydroelectric energy storage where two water reservoirs at different elevations are used to generate power. Water moves down from one reservoir to the other (discharge), passing through a turbine, and then requires power to be pumped back into the upper reservoir (recharge).

Source: https://indianexpress.com/article/business/tata-power-to-start-work-on-two-pumped-hydro-projects-in-maharashtra-by-mid-2024-9046472/

https://indianexpress.com/article/business/after-coal-and-gas-govt-bolsters-hydro-capacity-to-meet-rising-peak-demand-9322704/”

https://www.energy.gov/eere/water/pumped-storage-hydropower