The policy that should be updated to address the problem of having only six days of audit logs from the last month available while investigating a malicious event is the retention policy. A retention policy is a policy that defines and specifies the duration and conditions for keeping or storing the records or data of an organization, such as audit logs, backups, or archives. A retention policy should be based on the legal, regulatory, operational, or business requirements of the organization, and should balance the costs and benefits of retaining or disposing the records or data. The problem of having only six days of audit logs from the last month available while investigating a malicious event indicates that the retention policy is inadequate or ineffective, as it does not ensure the availability or accessibility of the audit logs for the investigation purposes. The retention policy should be updated to address this problem by extending or adjusting the retention period or criteria for the audit logs, and by enforcing or monitoring the compliance with the retention policy. The other options are not the policies that should be updated to address this problem, but rather different or irrelevant policies. A reporting policy is a policy that defines and specifies the procedures and actions for communicating or disclosing the information or incidents of an organization, such as audit results, security breaches, or performance metrics. A reporting policy should be based on the legal, regulatory, operational, or business requirements of the organization, and should ensure the accuracy, timeliness, and completeness of the reporting. A recovery policy is a policy that defines and specifies the objectives and strategies for restoring the normal operations of an organization after a disaster or disruption, such as recovery time objective, recovery point objective, or recovery methods. A recovery policy should be based on the business impact analysis and risk assessment of the organization, and should ensure the continuity, resilience, and availability of the organization. A remediation policy is a policy that defines and specifies the procedures and actions for correcting or improving the security or performance of an organization, such as vulnerability remediation, incident response, or root cause analysis. A remediation policy should be based on the security assessment and audit findings of the organization, and should ensure the effectiveness, efficiency, and compliance of the organization. References: CISSP All-in-One Exam Guide, Eighth Edition, Chapter 7, p. 376; Official (ISC)2 CISSP CBK Reference, Fifth Edition, Chapter 7, p. 406.