Which of the following controls is typically the most expensive to implement?

The choice of security guards as the most expensive control to implement is grounded in various factors associated with human resources, ongoing training, and management. While security cameras, alarm systems, and access control systems involve upfront equipment and installation costs, security guards require a continuous financial commitment.

Employing security personnel entails salaries, benefits, and possibly overtime pay, which contribute to significant long-term expenses. Additionally, the costs associated with training and maintaining an effective security team can add to the financial burden. Unlike automated systems that may require periodic upgrades or maintenance, the costs of personnel remain relatively constant and can escalate based on the number of guards needed, their expertise, and the specific security requirements of the environment.

The other options, while they do involve costs, primarily consist of equipment or infrastructure expenses which can be managed or amortized over time and are more predictable than the ongoing personnel costs associated with security guards. Thus, the financial implications of hiring and maintaining a team of security guards clearly establish them as typically the most expensive control to implement.