What should be a primary concern for an IS auditor regarding the organization's information security policy?

A primary concern for an IS auditor regarding the organization's information security policy is its annual review by senior management. This review is essential as it ensures that the policy remains relevant and effective in addressing current security threats and risks faced by the organization. The involvement of senior management in the review process also highlights the importance of information security within the organization, ensuring that adequate resources and attention are allocated to it.

An annual review allows for the assessment of the organization's security posture and the effectiveness of the policies in place. It helps identify any gaps or weaknesses in the existing policy and enables timely adjustments to be made to adapt to an ever-evolving threat landscape. This proactive approach is critical for maintaining robust security controls and ensuring compliance with industry standards and regulations.

Other factors like regulatory compliance objectives, software compliance audit methods, and the frequency of IT policy amendments are also important, but they typically derive their relevance from the framework provided by a well-maintained and effectively reviewed information security policy. Without such a foundational review process, these other aspects could become less meaningful or effective in mitigating risks.