The owner’s formal acceptance of a security system—usually after site acceptance testing—is the point at which the warranty period typically begins. From this moment, the vendor or contractor is responsible for addressing defects or performance issues as stipulated in the contract.
B and C (Phase II references) are not standard project stages.
D (Site acceptance testing) occurs before acceptance and warranty activation.
[References:, PSP Study Guide – Project Phases and System Acceptance, POA Manual – Contractual Obligations and Warranty Initiation]
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