Explanation:

Establishment of a Board of Revenue at Calcutta: Yes, Warren Hastings established a Board of Revenue in Calcutta to improve the administration of revenue collection.

Abolishing the judicial functions of the Zamindars: Yes, he took steps to reduce the judicial authority of zamindars as a part of his judicial reforms to create a more streamlined and accountable judicial system.

Appointment of Indian Judges in Criminal Courts: Yes Warren Hastings made efforts to involve Indians in the administration, but the extent to which Indians were appointed as judges in criminal courts during his tenure 

Based on the above, it seems like the first two statements are more directly associated with Warren Hastings' reforms. Hence, the answer would be:

All Three