Applying due professional care in planning an assurance engagement includes assessing the risks involved in the engagement area. An assessment of the risk of noncompliance with laws and regulations directly addresses the potential legal and regulatory exposures that could significantly impact the organization. This risk assessment helps ensure that the audit plan is appropriately focused and aligned with key risks, demonstrating due professional care.
IIA standards on planning, which stipulate that due professional care includes an appropriate risk assessment.

The authority of the internal audit activity is best demonstrated through its ability to determine the scope of internal audit services. This authority, granted by the board and senior management, ensures that internal auditors have the freedom to assess and address risks appropriately across the organization without undue influence, reflecting a key element of internal audit's role in organizational governance.
IIA Standard 1110 - Organizational Independence, which emphasizes the authority of the internal audit activity to define its own scope as a critical aspect of its independence and authority.

The scenario where employee personal information in the payroll system could be updated without approval presents a significant concern for fraud risk. This lack of control creates an opportunity for unauthorized changes to employee information, potentially leading to fraudulent activity such as ghost employee schemes or unauthorized salary alterations. Such a control weakness directly impacts the integrity of payroll transactions and should be a primary concern for internal auditors.References: Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)

Ethics are indeed not defined by laws alone; they are based on standards of conduct derived from shared principles and values. This statement most accurately reflects the nature of ethics in the context of corporate social responsibility (CSR), emphasizing that while ethics are guided by laws, they fundamentally originate from broader societal values and the ethical norms of the community.
Basic ethical principles in CSR and business ethics literature

The most effective way a chief audit executive (CAE) can demonstrate to the board that the internal audit team has the necessary skills to achieve its annual goals is through a competency assessment. This assessment measures and documents the collective skills and knowledge within the internal audit activity, ensuring they align with the requirements of the audit plan and the organization ' s objectives. Competency assessments can identify gaps and provide a basis for training and development, making it an essential tool for demonstrating capability.
The Institute of Internal Auditors (IIA) - International Professional Practices Framework (IPPF)