The most accurate statement regarding the internal audit charter according to IIA guidance is that the charter must be approved by both senior management and the board. This ensures that the internal audit activity's purpose, authority, and responsibility are clearly defined and acknowledged by the organization's leadership, facilitating alignment with organizational governance.
The IIA's guidance on internal audit charters, which emphasizes approval by senior management and the board as a key requirement.

Input controls are designed to ensure the accuracy, completeness, and validity of data entered into a business application. These controls can include validation checks, input masks, and error detection methods that verify data at the point of entry. Whether data is entered directly by staff, remotely by business partners, or through web-enabled applications, input controls help maintain the integrity of the data by preventing errors and unauthorized input. These controls are crucial in maintaining data quality and integrity in any business application.
The IIA's Global Technology Audit Guide (GTAG) on Information Technology Controls.
COBIT 5 Framework on Information and Technology Governance.

The nature of services provided by the internal audit activity, including training management on internal controls, is typically defined in the audit charter. The audit charter outlines the purpose, authority, and scope of the internal audit activity, including any advisory services it provides, such as training. It establishes the framework within which the internal audit team operates and serves as a formal document that specifies the arrangement between the internal audit function and the rest of the organization.
IIA Standard 1000: Purpose, Authority, and Responsibility.

Ensuring an organization's risk management program remains effective over time is most critically supported by conducting a combination of ongoing risk reviews and individual evaluations. This approach allows for continuous monitoring and updating of the risk landscape, ensuring that the risk management processes adapt to changes in both internal and external conditions.
IIA guidance on effective risk management practices