There are four features of morality which Hart says are necessary for a clear picture of his concept of law. These four features, he describes under the heads of

A. Command, Sovereign, Duty and Sanction

B. Accordance, Duty, Obedience and Moral Pressure

C. Importance, Immunity from deliberate change, Voluntary character of moral offences and Forms of moral pressure

D. Primary Rules, Secondary Rules, Rules of Recognition and Moral Pressure

Answer: Option C