正解:A
Theaudit charteris a formal document that definesthe purpose, authority, and responsibilitiesof the internal audit function.
Audit Charter (Correct Answer - A)
Establishesroles, reporting structure, and independenceof the audit team.
Example:TheIS audit team's roleinrisk assessmentsis outlined in the charter.
Annual Audit Plan (Incorrect - B)
Outlinesaudit activitiesbutdoes not define roles and responsibilities.
Engagement Letter (Incorrect - C)
Used forspecific audits, not theentire audit function.
Audit Scope Letter (Incorrect - D)
Detailswhat is coveredin an audit but doesnot define responsibilities.
References:
ISACA CISA Review Manual
COBIT 2019 (Audit Governance)