Bob Johnson, the company cashier, was known throughout the company as a workaholic. After three years on the job, Bob suddenly suffered heart problems and was incapacitated for several weeks. While he was out of the office, the treasurer temporarily assumed his duties and discovered that Bob had misappropriated several thousand dollars since he was hired.

A. Firewall

B. Personnel termination control plans

C. Access control software

D. Personnel selection and hiring control plans

E. Continuous data protection

F. Rotation of duties and forced vacations