What is the approximate number of recorded Revenue Villages in the administrative structure of Bihar?

How does the Ganges River topographically divide the fertile flat plains of Bihar regarding its primary climate-related challenges?

Consider the following statements regarding the geographical and topographical features of Bihar: I. The Batia hill ranges serve as a natural physical barrier that separates the Chakai Plateau from the undulating northern terrains of the region. II. The Someshwar Pass, a major natural pass situated in the Someshwar Range, is associated with the Harha River. III. The Mahananda Plain is drained by major rivers that include the Mahananda, Kankai, and Ratua. Which of the statements given above are correct?