The combination of systems in a computer that supports the organization’s security policy is known as what?

The term that best describes the combination of systems in a computer that supports an organization’s security policy is "Trusted Computing Base" or TCB. The TCB encompasses all hardware, firmware, and software components that enforce your organization's security policy. The core function of the TCB is to ensure that only authorized activities can occur, thus providing a secure environment for data processing and storage.

A TCB needs to have a number of properties, including but not limited to integrity, confidentiality, and availability, in order to effectively safeguard an organization's information.

In contrast, while concepts like the IT foundation, core network, and high-assurance processing system play roles in IT and security frameworks, they do not specifically address the comprehensive set of components that implement the security policy in the same way the TCB does. Thus, the concept of the TCB is a fundamental component in maintaining a secure computing environment.