The audit charter is a document that defines the purpose, scope, authority, and responsibility of an IT audit organization. The audit charter should specify roles and responsibilities within an IT audit organization, such as who is accountable for approving the audit plan, who is responsible for conducting the audits, who is authorized to access the audit evidence, and who is accountable for reporting the audit results. The organizational chart, the engagement letter, and the annual audit plan are also important documents for an IT audit organization, but they do not specify roles and responsibilities as clearly and comprehensively as the audit charter.

The primary reason for an IS auditor to perform a risk assessment is to help identify areas with a relatively high probability of material problems. A risk assessment is a systematic process of evaluating the potential risks that may be involved in an activity or undertaking. It involves identifying the sources of risk, analyzing the likelihood and impact of the risk, and prioritizing the risks based on their significance. A risk assessment helps the IS auditor to focus on the areas that are most vulnerable to errors, fraud, or inefficiencies, and to design appropriate audit procedures to address those risks. A risk assessment also helps the IS auditor to allocate audit resources efficiently and effectively.
A risk assessment does not provide a basis for the formulation of corrective action plans, as this is a responsibility of management, not the IS auditor. A risk assessment does not increase awareness of the types of management actions that may be inappropriate, as this is a matter of professional ethicsand judgment. A risk assessment does not help to identify areas that are most sensitive to fraudulent or inaccurate practices, as this is a result of the risk assessment, not its purpose.
References:
ISACA, CISA Review Manual, 27th Edition, Chapter 1: The Process of Auditing Information Systems, Section 1.3: Risk Assessment in Planning1 Corporate Finance Institute, Audit Risk Model2

Ongoing monitoring of the audit activities is the most important activity to include as part of the quality assurance (QA) program requirements for an internal audit department. An IS auditor should perform regular reviews and evaluations of the audit processes, methods, standards, and outcomes to ensure that they comply with the QA program objectives and criteria. This will help to maintain and improve the quality and consistency of the audit services and deliverables. The other options are less important activities to include as part of the QA program requirements, as they may involve long-term resource planning, user satisfaction reports, or feedback from internal audit staff. References:
CISA Review Manual (Digital Version), Chapter 2, Section2.61
CISA Review Questions, Answers and Explanations Database, Question ID 224