Which of the following is essential for confirming a system's compliance with standards?

Completion certification is essential for confirming a system's compliance with standards because it serves as official documentation that verifies the system meets all regulatory and legal requirements upon project completion. This certification is typically issued after thorough inspections and assessments have been conducted, ensuring that all components, installations, and systems adhere to the necessary codes, safety standards, and performance criteria. It acts as a formal acknowledgment that the work has been completed satisfactorily and in alignment with established guidelines.

In contrast, while fit plans outline the setup of systems and structures, they do not provide direct assurance of compliance with standards. Manufacturer's instructions are important for correct installation and operation, but they do not serve as a comprehensive verification of compliance post-installation. Maintenance procedures are critical for keeping a system operational and safe over time but do not confirm compliance with standards at the completion stage.