Case C-656/20 P: Judgment of the Court (Seventh Chamber) of 24 March 2022 — Hermann Albers eK v European Commission, Federal Republic of Germany, Land Niedersachsen (Germany) (Appeal — State aid — Concept of ‘aid’ — Public transport of passengers — Offsetting of costs involved in the performance of public service obligations — Transfer of financial resources between public authorities — Obligation for municipal authorities that organise transport to guarantee reduced tariffs for students and apprentices — Lack of an advantage granted by the State to an undertaking — Obligation to notify)