In India, separation of judiciary from the executive is enjoined by

The correct option is "a Directive Principle of State Policy".

In the Constitution of India, the separation of the judiciary from the executive is explicitly enjoined by the Directive Principles of State Policy (DPSP). Specifically, this separation is mandate under Article 50 of the Constitution.

Article 50, which is part of Part IV (Directive Principles of State Policy) of the Constitution of India, states:
"The State shall take steps to separate the judiciary from the executive in the public services of the State."

This separation is crucial to ensure the independence of the judiciary, preventing the executive branch of government from influencing or interfering in judicial proceedings, thereby upholding the rule of law and protecting individual liberties.