The collector must prepare records through:

The Patwari is the correct answer because they are the foundational land record officer responsible for maintaining village land records, conducting field measurements, and assisting the Collector in the preparation and updating of these crucial documents. They are the primary point of contact for land-related data at the grassroots level.

• Kanungo supervises the Patwaris but does not directly prepare the records.
• Tehsildar is a higher revenue officer who oversees the work of both Patwaris and Kanungos, but the direct preparation is not their role.
• Union Nazim is a local government official, not involved in land record preparation.