Which of the following would be a preventive control for helping to manage fraud in...

Preventive controls are designed to prevent fraud or errors before they occur. A code of conduct and whistleblower policy signed by all employees annually helps to establish ethical behavior standards and provides a mechanism for reporting unethical behavior, thereby preventing potential fraud. References:

Institute of Internal Auditors (IIA) Standards on Internal Control and Fraud Prevention.

COSO Internal Control Framework.