What does NIST 800-53 specifically recommend?

NIST SP 800-53 outlines a comprehensive set of security and privacy controls specifically tailored for federal information systems with the goal of protecting organizational operations, assets, and individuals from a diverse array of threats. Option C highlights that these controls apply specifically to federal information systems while explicitly excluding those intended for national security systems, which have their own distinct requirements under different guidelines.

This focus allows for a more targeted approach to security within civilian federal systems, ensuring that organizations implement safeguards designed to meet their particular needs in a non-national security context. The recognition of the unique security concerns pertinent to federal information systems, while delineating them from national security considerations, illustrates NIST's intent to provide effective guidance tailored to specific operational environments.

On the other hand, while other options involve relevant topics such as national security information systems or risk assessment methodologies, they either overlap with broader categories or focus areas that are outside the specific scope of NIST 800-53's aim to provide detailed, actionable security controls for federal information systems. Thus, the emphasis on federal systems without national security implications accurately captures the essence of what NIST 800-53 is designed to address.