The correct option is "Neither 1 nor 2" because solar power is versatile and can be employed for both surface pumps and submersible pumps, as well as various types of pumps, including centrifugal and piston pumps. Solar water pumping systems can be designed to accommodate different pump types depending on the agricultural and geographical requirements, making solar energy a flexible and efficient solution for irrigation and water supply across diverse settings. This aligns with the understanding of renewable energy applications in agriculture as outlined in standard reference materials used by UPSC.