The most important reason for having an information security manager serve on the change management committee is to advise on change-related risk. Change management is the process of planning, implementing, and controlling changes to the organization's IT systems, processes, or services, in order to achieve the desired outcomes and minimize the negative impacts1. Change-related risk is the possibility of adverse consequences or events resulting from the changes, such as security breaches, system failures, data loss, compliance violations, or customer dissatisfaction2.
The information security manager is responsible for ensuring that the organization's information assets are protected from internal and external threats, and that the information security objectives and requirements are aligned with the business goals and strategies3. Therefore, the information security manager should serve on the change management committee to advise on change-related risk, and to ensure that the changes are consistent with the information security policy, standards, and best practices. The information security manager can also help to identify and assess the potential security risks and impacts of the changes, and to recommend and implement appropriate security controls and measures to mitigate them. The information security manager can also help to monitor and evaluate the effectiveness and performance of the changes, and to identify and resolve any security issues or incidents that may arise from the changes4.
The other options are not as important as advising on change-related risk, because they are either more specific, limited, or dependent on the information security manager's role. Identifying changes to the information security policy is a task that the information security manager may perform as part of the change management process, but it is not the primary reason for serving on the change management committee. The information security policy is the document that defines the organization's information security principles, objectives, roles, and responsibilities, and it should be reviewed and updated regularly to reflect the changes in the organization's environment, needs, and risks5. However, identifying changes to the information security policy is not as important as advising on change-related risk, because the policy is a high-level document that does not provide specific guidance or details on how to implement or manage the changes.
Ensuring that changes are tested is a quality assurance activity that the change management committee may perform or oversee as part of the change management process, but it is not the primary reason for having an information security manager on the committee. Testing is the process of verifying and validating that the changes meet the expected requirements, specifications, and outcomes, and that they do not introduce any errors, defects, or vulnerabilities. However, ensuring that changes are tested is not as important as advising on change-related risk, because testing is a technical or operational activity that does not address the strategic or holistic aspects of change-related risk. Ensuring changes are properly documented is a governance activity that the change management committee may perform or oversee as part of the change management process, but it is not the primary reason for having an information security manager on the committee. Documentation is the process of recording and maintaining the information and evidence related to the changes, such as the change requests, approvals, plans, procedures, results, reports, and lessons learned. However, ensuring changes are properly documented is not as important as advising on change-related risk, because documentation is a procedural or administrative activity that does not provide any analysis or evaluation of change-related risk. References = 1: CISM Review Manual 15th Edition, Chapter 2, Section 2.5 2: CISM Review Manual 15th Edition, Chapter 2, Section 2.5 3: CISM Review Manual 15th Edition, Chapter 1, Section 1.1 4: CISM Review Manual 15th Edition, Chapter 2, Section 2.5 5: CISM Review Manual 15th Edition, Chapter 1, Section 1.3 : CISM Review Manual 15th Edition, Chapter 2, Section 2.5 : CISM Review Manual 15th Edition, Chapter 2, Section 2.5

The organization's risk appetite is the most important factor to consider when defining control objectives, because it reflects the amount and type of risk that the organization is willing to accept or avoid in pursuit of its goals. Control objectives should align with the risk appetite and support the achievement of the organization's objectives. Industry best practices, an information security framework, and control recommendations from a recent audit are also useful sources of guidance, but they are not as critical as the risk appetite.
References = CISM Review Manual, 16th Edition, page 75

The best starting point for a newly hired information security manager who has been tasked with identifying and addressing network vulnerabilities is C. Penetration testing. This is because penetration testing is a method of simulating real-world attacks on a network to evaluate its security posture and identify any weaknesses or gaps that could be exploited by malicious actors. Penetration testing can help the information security manager to assess the effectiveness of the existing controls, prioritize the remediation efforts, and demonstrate compliance with the relevant standards and regulations. Penetration testing can also provide valuable insights into the network architecture, configuration, and behavior, as well as the potential impact and likelihood of different types of attacks.
References = CISM Review Manual 15th Edition, Chapter 4, Section 4.2.1, page 2091; CISM Review Questions, Answers & Explanations Manual 9th Edition, Question 50, page 14

Comprehensive and Detailed Step-by-Step Explanation:
An effective information security program aims to manage risks to acceptable levels while supporting business objectives.
* A. Risk is treated to an acceptable level: This is the BEST answer as it directly reflects the program's success in mitigating risks within the organization's tolerance levels.
* B. The number of security incidents reported by staff has increased: An increase in reported incidents might indicate improved awareness but does not necessarily reflect overall effectiveness.
* C. Key risk indicators (KRIs) are established: KRIs are important for monitoring risks but do not indicate whether risks are being effectively managed.
* D. Policies are reviewed and approved by senior management: While essential, this action alone does not demonstrate the program's effectiveness.
Reference: CISM Job Practice Area 2 (Risk Management) highlights the importance of risk treatment and its alignment with organizational risk tolerance.

A false negative is a security incident that was not detected by the SIEM system, which presents the greatest risk as it allows attackers to compromise the organization's assets and data without being noticed or stopped.
A high number of false negatives can indicate that the SIEM system is not configured properly, has insufficient data sources, or lacks effective analytics and correlation rules. (From CISM Review Manual 15th Edition) References: CISM Review Manual 15th Edition, page 181, section 4.3.2.4.