What must be met according to start-up requirements before systems can be commissioned?

The identified correct option highlights that specific conditions and procedures must be fulfilled before commissioning activities can commence. This involves ensuring that all necessary pre-commissioning tasks, such as functional testing, installation verifications, and system calibrations, have been adequately completed according to established protocols.

Commissioning is a systematic process that aims to ensure that all building systems operate according to the design intent and the owner's requirements. Without meeting these specific conditions—like verifying that systems are installed correctly, properly configured, and functioning as intended—the commissioning process may lead to inaccuracies, inefficiencies, or failures in system performance.

General completion of the project, while desirable, does not encompass the detailed, systematic criteria necessary for commissioning. Approval from only the construction manager might overlook critical input from other stakeholders needed to ensure comprehensive readiness. Lastly, completion of exterior finishes is related to aesthetics and does not directly relate to the operational readiness of mechanical, electrical, and plumbing systems essential for the commissioning process to begin.