The correct answer is option 4: Separation of Powers. The principle of separation of powers is a fundamental concept in a Presidential Government. It means that the powers of the government are divided among three separate branches - the executive, legislative, and judicial branches. Each branch has its own distinct powers and responsibilities, and they act as a check and balance on each other. This principle ensures that no single branch of government becomes too powerful, and it helps to maintain a system of checks and balances to prevent the abuse of power. It also promotes accountability and prevents the concentration of power in the hands of a few individuals. Therefore, the Presidential Government operates based on the principle of separation of powers.