Which of the following would be the GREATEST concern for an IT risk practitioner when an employees.....

An outdated organizational structure is an administrative issue that doesn't directly pose an immediate IT security risk related to a specific employee's access.

Failure to remove unnecessary access permissions for a departed or role-changed employee creates a significant security vulnerability, as the former employee or an attacker leveraging their old credentials could potentially access sensitive systems and data without authorization. This directly impacts the principle of least privilege and can lead to data breaches or system compromise.

While company equipment not being retained is an asset management and potential data loss risk, it is generally less immediate and pervasive than the risk of active unauthorized system access through unrevoked permissions.

Lack of job knowledge transfer impacts operational continuity and efficiency but is not an IT security or risk management concern for an IT risk practitioner related to the employee's access.