Which term describes a firm, corporation, or organization that provides security exclusively for a business that employs them?

The term that accurately describes a firm, corporation, or organization that provides security exclusively for a business that employs them is often referred to as an "Employer." This indicates that the security personnel are directly hired by the business, making them employees of that organization rather than independent contractors or part of a third-party security service.

When security personnel are employed by a business solely to protect that business's assets, staff, and clientele, they are considered internal security personnel. This structure allows for streamlined communication and a deep understanding of the specific security needs and protocols of the business, creating a tailored security approach. The relationship here emphasizes loyalty and commitment to the employer, as the security staff is directly accountable to that business.

In contrast, a security agency typically serves multiple clients and may provide security staff across various organizations, while a private detective agency focuses more on investigation and surveillance rather than on business security. The term "firm" can be generic and doesn’t specifically denote the relationship between security service and the employing business in the context of this question.