The correct option is D All the above
Cornwallis was appointed as Governor General of Bengal in 1786. He
introduced permanent Land Revenue System in 1793. He separated the
Judicial and police powers from the collector and also brought the
district collector under the purview of judiciary. He divided the Bengal
province into four parts. i.e. Patna, Murshidabad, Calcutta and Decca
and established circuit courts in each parts.