Which security practice would have addressed unauthorized access to accounts after an executive departure?

The correct choice focuses on the offboarding process, which is crucial when an executive or any employee leaves an organization. Offboarding involves a series of steps to ensure the smooth transition of responsibilities and the revocation of access rights. When an employee departs, particularly someone in a high-level position, it is essential to remove their access to all systems, networks, and sensitive information promptly. This action mitigates the risk of unauthorized access and potential data breaches that could occur if access credentials are left active after they have left the organization.

In contrast, a non-disclosure agreement primarily protects the confidentiality of sensitive information but does not directly address the need to revoke access rights. The concept of least privilege ensures that users have only the permissions necessary for their roles, but this is more about managing permissions while the employee is active rather than in the context of their departure. An acceptable use policy outlines the acceptable behavior for users regarding the organization’s resources but does not specifically focus on access management during the offboarding process. Thus, offboarding is the most relevant and effective practice to address unauthorized access following an executive's departure.