The Incident Response Policy is the best resource for an employee to review first when a security breach is suspected, as it specifically outlines the procedures for reporting and responding to security incidents. An Acceptable Use Policy defines the correct usage of company resources rather than procedures for incident reporting. While the overall Information Security Policies may briefly describe the organization's stance on incident handling, it is the Incident Response Policy that contains the detailed step-by-step response procedures. The Disaster Recovery Policy primarily addresses the steps for recovering operations post-disaster, not the incident reporting process.