Option b is the correct answer. The word "Batai" during the Medieval period referred to the "System of calculating revenue." This system, also known as Galla-bakhshi, was a method of crop-sharing prevalent during the Mughal period. In this system, the harvested produce was divided into three shares, with one share being collected by the state as revenue. Peasants had the flexibility to pay their dues in either cash or kind. Important Tips During the rule of Akbar and his successors, three distinct systems of revenue assessment were in practice: Batai or Galla-bakhshi System, Kankut System, and Nasaq System. Kankut System: The Kankut system, another traditional method, estimated the yield (kut) based on on-the-spot inspections, instead of physically dividing the grain (kan). A fixed portion - one-third of the estimated produce - was established as the state's share. This method relied on practical inspections and historical data to arrive at an approximate estimate of the harvest. Nasaq System: Prevalent mainly in the Mughal Empire's Bengal region, the Nasaq System operated based on rough calculations derived from peasants' past revenue records. Unlike the previous systems, it didn't require direct measurements but used existing records to ascertain the area under cultivation.