The auditor evaluates the internal control system to determine the reliability of financial reporting. By observing procedures and testing controls, the auditor assesses whether the organization's mechanisms are effective in preventing errors and fraud.

Internal audit is a systematic process conducted within an organization to evaluate the effectiveness of financial reporting, risk management, and internal controls. It ensures that financial records are accurate and that the company complies with established policies and regulations. This internal review process is essential for maintaining operational integrity and providing management with reliable data for decision-making purposes.

A management audit is an internal assessment of the efficiency and effectiveness of a company's management team. Since it is a voluntary internal review aimed at improving operational performance, it is typically commissioned by the Board of Directors to evaluate the strategic and operational health of the organization.

Internal audit serves as a proactive control mechanism. By reviewing operational processes and financial records, it helps management identify weaknesses in the system, thereby acting as a deterrent and a preventive measure against the occurrence of errors and fraudulent activities within the business.

Internal check is a system of accounting where the duties of different staff members are arranged in such a way that the work of one person is automatically checked by another. This minimizes the risk of fraud and error by ensuring that no single individual has complete control over a transaction from start to finish.

An internal auditor is an employee or a contracted professional appointed by the management of an organization. Their primary role is to assist management by evaluating the effectiveness of internal controls, risk management, and governance processes, rather than reporting directly to shareholders like a statutory auditor.

In corporate governance, the auditor is appointed by the shareholders to represent their interests. Consequently, the power to remove an auditor before the expiry of their term typically rests with the shareholders acting through a resolution passed at a General Meeting, ensuring independence from the management team.

In many jurisdictions, a casual vacancy in the office of an auditor, particularly one caused by resignation, must be filled by the shareholders in a general meeting. While the Board of Directors may sometimes fill a vacancy temporarily, the formal appointment usually requires shareholder approval.

Negligence occurs when an auditor fails to exercise the reasonable care and skill expected of their profession. By failing to examine the Articles of Association, the auditor neglects their duty, leading to improper financial decisions like paying dividends out of capital.

The appointment period for an auditor varies significantly depending on the jurisdiction and the specific company laws (e.g., Companies Act in various countries). Because there is no universal fixed term of three, four, or five years applicable to all companies globally, 'None of these' is the correct choice as the term is defined by specific legal statutes.