The correct options are
A Rooftop Rainwater harvesting
B Bamboo Drip Irrigation System
C Inundation Canal System
The various methods of rainwater harvesting are: Kuls, Khadins, Bamboo drip irrigation systems, Inundation canal systems, and Rooftop rainwater harvesting. Tanki system is not a rainwater harvesting method but is rather used to store groundwater.