Detailed Explanation:

Answer: Option 4 — Separation of powers

The doctrine of Separation of Powers, which divides governmental authority among the legislature, executive, and judiciary, constitutes the best safeguard of liberty in a liberal democracy. This separation prevents concentration of power in any single branch and ensures that each organ acts as a check and balance on the others, thereby protecting individual rights and freedoms from arbitrary state action.

📝 Short Notes: Separation of Powers

• Basic Principle: Division of governmental powers among three independent organs—Legislature (makes laws), Executive (implements laws), and Judiciary (interprets laws).
• Origin: Propounded by French philosopher Montesquieu in his work 'The Spirit of Laws' (1748) as essential for political liberty.
• Indian Context: India follows a system of checks and balances rather than strict separation. While functional separation exists, there is considerable overlap (e.g., Council of Ministers is part of both legislature and executive).
• Constitutional Provisions: Articles 50 (separation of judiciary from executive), 53 (executive power vested in President), 74 (Council of Ministers to aid President), and 121/211 (restrictions on discussing judicial conduct in legislature).
• Checks and Balances: Legislature controls executive through no-confidence motions and financial control; Judiciary reviews executive actions and legislative enactments through judicial review; Executive appoints judges and implements court decisions.
• Why Best Safeguard: Prevents tyranny by ensuring no single organ becomes all-powerful; protects individual liberty by distributing authority; enables accountability through mutual oversight.