Case C-267/18: Judgment of the Court (Fourth Chamber) of 3 October 2019 (request for a preliminary ruling from the Curtea de Apel București — Romania) — Delta Antrepriză de Construcții și Montaj 93 SA v Compania Națională de Administrare a Infrastructurii Rutiere SA (Reference for a preliminary ruling — Public Procurement — Public procurement procedure — Directive 2014/24/EU — Article 57(4) — Optional grounds for exclusion — Exclusion of an economic operator from participating in a public procurement procedure — Early termination of a prior contract on account of partial subcontracting — Concept of ‘significant or persistent deficiencies’ — Scope)