Correct Option: D. By unilateral action Explanation of the Correct Answer: In a presidential system of government, the president holds significant executive powers, which include the authority to appoint and relieve ministers or members of the cabinet. The term "unilateral action" refers to the president's ability to make decisions independently, without needing approval or consultation from other branches of government, such as the legislature or judiciary.

1. Presidential Authority: The president is often seen as the head of state and government, which grants them the power to manage the executive branch. This includes the ability to hire and fire ministers. The rationale behind this power is that the president needs to ensure that their administration is aligned with their policies and vision for governance.
2. Separation of Powers: In a presidential system, there is a clear separation of powers among the executive, legislative, and judicial branches. This separation allows the president to act independently in certain areas, including the appointment and dismissal of ministers. The president's unilateral action in relieving a minister is a reflection of this separation, as it does not require legislative approval.
3. Political Accountability: While the president can relieve a minister unilaterally, this action is often subject to political consequences. If a minister is dismissed, it may lead to public scrutiny or political backlash, especially if the reasons for dismissal are not clear or justified. However, the legal framework allows the president to make this decision without needing to consult the legislature or judiciary.

Explanation of Why Other Options Are Wrong or Weaker:

• Option A: In consultation with the legislature This option is incorrect because, in a presidential system, the president does not need to consult the legislature to relieve a minister. While some parliamentary systems require a vote of no confidence from the legislature to remove a minister, this is not the case in presidential systems. The president has the authority to make such decisions independently.
• Option B: After serving a full tenure This option is misleading. Ministers in a presidential system do not have fixed terms that must be completed before they can be relieved of their duties. The president can dismiss a minister at any time, regardless of how long they have served. Therefore, the notion of needing to serve a full tenure is not applicable.
• Option C: In consultation with the judiciary This option is also incorrect. The judiciary's role in a presidential system is to interpret laws and ensure justice, not to participate in the executive decision-making process regarding the appointment or dismissal of ministers. The president does not need to consult the judiciary for such actions.

Summary of Key Points:

• The president can relieve a minister unilaterally in a presidential system, reflecting their executive authority.
• This power is rooted in the principle of separation of powers, allowing the president to act independently.
• Other options (A, B, C) are incorrect as they imply a need for consultation or fixed terms, which do not apply in this context.
• Understanding the dynamics of executive power is crucial for grasping how governance operates in a presidential system.