Final answer:
The policy that best reduces the risk of malicious activity occurring after a SOC tour is Access control.
Step-by-step explanation:
The policy that best reduces the risk of malicious activity occurring after a SOC tour is Access control. Access control refers to the practice of restricting access to certain areas or information only to authorized individuals. By implementing strong access control measures, such as requiring identification badges, limiting access to critical areas, and monitoring visitor activities, the bank can minimize the risk of unauthorized access and potential malicious activities.
Password complexity and acceptable use policies are important for overall information security, but they may not directly address the risk posed by potential investors during SOC tours. Clean desk policy, on the other hand, focuses on maintaining tidiness and organization in the workplace, but it may not directly address the risk of malicious activity after a tour.