The IT Department of a financial institution decided to implement preventive controls to avoid potential security breaches. Therefore, they separated the development, testing, and operating…

The IT Department of a financial institution decided to implement preventive controls to avoid potential security breaches. Therefore, they separated the development, testing, and operating equipment, secured their offices, and used cryptographic keys. However, they are seeking further measures to enhance their security and minimize the risk of security breaches. Which of the following controls would help the IT Department achieve this objective?