Administrative efficiency is widely considered a significant merit of the Cabinet system, as it allows for swift decision-making and policy implementation. Therefore, listing it as a drawback is factually incorrect within the context of political theory. The other options, such as potential cabinet dictatorship or instability in coalition scenarios, are commonly cited as potential disadvantages of the system.

The Prime Minister serves as the head of government and the leader of the Cabinet. They hold the discretionary power to appoint, reshuffle, or dismiss ministers. This authority allows the Prime Minister to manage the executive team, ensure political alignment, and respond to changing administrative needs or political circumstances, thereby maintaining the cohesion and effectiveness of the government.

Collective responsibility dictates that all Cabinet ministers are jointly accountable to the legislature for the policies and actions of the government. If the Cabinet loses the confidence of the legislature, the entire government must resign. This ensures that ministers support Cabinet decisions publicly, even if they disagreed during private deliberations, maintaining a unified front.

In parliamentary democracies, the executive branch is derived from the legislature. The Prime Minister is customarily the leader of the political party or coalition that commands a majority in the lower house of parliament. This ensures that the government maintains the confidence of the legislature, which is a fundamental requirement for the stability of a parliamentary system.

The Cabinet system, particularly in the Westminster model, is widely regarded as functioning most effectively within a two-party system. This structure typically provides a clear majority for the governing party, ensuring legislative stability and a strong, cohesive executive, while also providing a distinct and organized opposition to hold the government accountable.

A hallmark of the parliamentary system is collective ministerial responsibility. This means that all cabinet members must publicly support government decisions, even if they disagree privately. If the government loses the confidence of the lower house, the entire cabinet must resign. This ensures that the executive remains accountable to the legislature as a unified body.

In a Cabinet system, executive power is vested in the Council of Ministers, which acts as a collective body. While the Prime Minister leads the Council, the authority to govern and implement policy is exercised through the collective decisions made by the ministers. This structure ensures that major policy directions are debated and approved by the executive leadership as a whole.

In a parliamentary system, the Prime Minister serves as the head of government and the leader of the cabinet. Consequently, they possess the executive prerogative to appoint, dismiss, or reshuffle cabinet ministers to ensure political alignment and effective governance. This power is a fundamental feature of the Westminster model, reflecting the Prime Minister's role as the primary architect of the executive branch's composition.

In modern states, the bureaucracy has seen a significant expansion in power due to the increasing complexity of public policy and the technical nature of governance. As governments take on more responsibilities in welfare, regulation, and economic management, the administrative apparatus has grown in size and influence, often becoming a central, albeit sometimes criticized, pillar of the modern state structure.

In parliamentary systems, civil servants utilize their technical expertise to draft complex legislative bills. However, because ministers are politically accountable to the legislature, they are the ones who formally introduce these bills. This process maintains the principle of ministerial responsibility, ensuring that elected officials take ownership of the policies and legislation proposed by the administrative machinery of the state.