Exp) Option d is the correct answer.

The Indian Constitution has established an integrated judicial system with the Supreme Court at the top and the high courts below it. Under a high court (and below the state level), there is a hierarchy of subordinate courts, that is, district courts and other lower courts. Integrated judicial system means that decisions made by higher courts are binding on the lower courts. All the lower courts from the Gram Panchayat to the High Courts are integrated into the Supreme Court of India.