Comprehensive and Detailed In-Depth Explanation:Operations security (OPSEC) focuses on identifying and protecting sensitive information to prevent unauthorized disclosure. In this scenario, the HR employee failed to safeguard confidential company information, leading to its exposure on social media. Training in OPSEC would reinforce the need to maintain security best practices, such as locking screens when away from a device and ensuring that sensitive data is not exposed in unsecured locations. * Hybrid work environmentpolicies relate to managing remote and in-office work but do not specifically cover security risks like unauthorized data exposure. * Data loss prevention (DLP)deals with technology-based solutions to prevent unauthorized data transfers but does not address physical security practices. * Social engineeringrefers to deceptive tactics used by attackers to manipulate individuals, which is not applicable to this situation. The HR employee should reviewoperations securitypolicies to prevent similar incidents in the future.