Which of the following statements is/are correct?
a. In modern day Rajasthan, the practice of rooftop rainwater water harvesting has gained popularity despite high water availability due to the Rajasthan Canal. b. Bikaner, Phalodi and Barmer harvest rainwater and store it in earthen embankments called khadins built across the lower hill slopes lying below gravelly uplands. c. Nearly every household in the city of Shillong has a roof top rainwater harvesting structure.
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