The most effective way to maintain network integrity when using mobile devices is to implement network access control. Network access control is a security control that regulates and restricts access to network resources based on predefined policies and criteria, such as device type, identity, location, or security posture.
Network access control can help maintain network integrity when using mobile devices by preventing unauthorized or compromised devices from accessing or affecting network systems or data. The other options are not as effective as network access control in maintaining network integrity when using mobile devices, as they do not address all aspects of network access or security. Implementing outbound firewall rules is a security control that filters and blocks network traffic based on source, destination, protocol, or port, but it does not regulate or restrict network access based on device characteristics or conditions. Performing network reviews is a monitoring activity that evaluates and reports on the performance, availability, or security of network resources, but it does not regulate or restrict network access based on device characteristics or conditions. Reviewing access control lists is a verification activity that validates and confirms the access rights and privileges of network users or devices, but it does not regulate or restrict network access based on device characteristics or conditions. References: CISA Review Manual (Digital Version), Chapter 5, Section
5.2.2

The greatest concern when reviewing an IT strategic plan is B. The plan does not support relevant organizational goals. This is because an IT strategic plan should align and integrate the IT goals and objectives with the organization's overall strategy and vision, and ensure that IT supports and enables the business processes and functions1. If the IT strategic plan does not support relevant organizational goals, it may lead to:
Suboptimal or negative outcomes and value for the organization, as IT investments and initiatives may not align with the organization's priorities, needs, or expectations1.
Conflicts or inconsistencies between IT and business functions, as IT may not deliver the expected level of service, quality, or performance2.
Wasted or inefficient use of resources, as IT may spend time, money, or effort on projects or activities that are not relevant or beneficial for the organization2.

The authority given to the audit function is one of the components that is found in an audit charter. According to the IIA, the audit charter is a formal document that defines internal audit's purpose, authority, responsibility and position within the organization1. The authority given to the audit function includes the scope of its activities, the access to records, personnel and physical properties relevant to its work, and the independence and objectivity of its staff2. The authority given to the audit function helps to ensure that internal auditors can perform their duties effectively and efficiently, and that they can provide assurance and consulting services that add value and improve the organization's operations3.
The other options are not found in an audit charter. The process of developing the annual audit plan is not part of the audit charter, but rather a separate document that outlines the methodology, criteria and resources for selecting and prioritizing audit engagements based on a risk assessment4. Required training for audit staff is not part of the audit charter, but rather a component of the quality assurance and improvement program that evaluates the competence and performance of internal auditors and provides them with opportunities for professional development5. Audit objectives and scope are not part of the audit charter, but rather specific elements of each individual audit engagement that define the expected outcomes and the boundaries of the audit work.