Surge tank and penstock are the components related to which of the power plant?

Correct option is A

​$$\text{Surge tank and penstock are essential components of a hydro-electric power plant:} \\[10pt]\bullet \ \textbf{Penstock} \\[4pt]\quad \bullet \ \text{A large-diameter pipe that carries water from the reservoir or forebay to the turbine.} \\[4pt]\quad \bullet \ \text{Designed to withstand high pressure and deliver water at controlled velocity.} \\[8pt]\bullet \ \textbf{Surge Tank} \\[4pt]\quad \bullet \ \text{A protective device connected to the penstock.} \\[4pt]\quad \bullet \ \text{It absorbs sudden pressure changes (water hammer) due to rapid load variations on the turbine.} \\[4pt]\quad \bullet \ \text{Helps maintain stable flow and prevents damage to the penstock and turbine.}$$​​