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In a mandatory periodic vehicle inspection, the absence of the certificate of ownership implies:

The presentation of the vehicle's identification documents, namely the vehicle registration document (livrete) and the certificate of ownership (título de registo de propriedade) (or the Single Automobile Document - Documento Único Automóvel), is a mandatory requirement for carrying out the periodic inspection. Without these documents, it is not possible to identify the vehicle, which prevents the inspection from being carried out. The other options are incorrect because the lack of documentation does not allow the inspection to begin, and there is no provision for issuing a provisional inspection or assigning a Grade 1 deficiency, as the vehicle cannot even be subjected to the tests.