Det følger heraf, at det tredje spørgsmål, litra f), skal besvares med, at artikel 4, stk. 1, i forordning nr. 2887/2000, sammenholdt med artikel 5a, stk. 3, i direktiv 90/387, kræver, at de nationale retter fortolker og anvender de nationale retsplejeregler på en måde, der sikrer, at en afgørelse om godkendelse af priser for ubundtet adgang til abonnentledninger truffet af en national tilsynsmyndighed kan anfægtes for domstolene, ikke kun af adressaten for en sådan afgørelse, men ligeledes af de i forordningen omhandlede adgangsberettigede, hvis rettigheder potentielt kan blive berørt af afgørelsen.
It follows from the above that the answer to Question 3(f) must be that Article 4(1) of Regulation No 2887/2000, read in conjunction with Article 5a(3) of Directive 90/387, requires that the national courts interpret and apply the domestic rules of proced- ure governing the bringing of appeals in such a way that a decision of the NRA concerning the authorisation of rates for unbundled access to the local loop may be challenged before the courts, not only by the undertaking to which such a decision is addressed but also by beneficiaries within the meaning of that regulation whose rights are potentially affected by it.