Final answer:
The correct term describing the components of an information system for accreditation purposes is the Authorization Boundary. It aligns with 'security perimeter' definitions within CNSS Instruction 4009 and DCID 6/3, outlining the security responsibility scope.
Step-by-step explanation:
The term that describes all components of an information system to be accredited by an authorizing official, excluding separately accredited systems to which the information system is connected, is known as the Authorization Boundary. This term is synonymous with the 'security perimeter' as defined in CNSS Instruction 4009 and DCID 6/3. The Authorization Boundary defines the scope of the system's security controls that the authorizing official is willing to accept responsibility for. These boundaries play a crucial role in managing system risks and ensuring the system meets specified security requirements before it is permitted to operate.