Final answer:
Passwords on a computer is not a preventive control, unlike process redesign, segregation of duty, job rotation, and requiring approvals.
Step-by-step explanation:
A preventive control is a measure put in place to mitigate or reduce risks and prevent problems from occurring. From the given options, process redesign, segregation of duty, job rotation, and requiring approvals can all be considered preventive controls as they are implemented to prevent errors, fraud, and inefficiencies. However, passwords on a computer is not a preventive control. While passwords provide a level of security to protect sensitive information, they are not specifically designed as preventive controls to reduce risks in a broader sense.