44It must therefore be noted that it is not apparent from that context that, where the Member State concerned has not chosen to extend the benefit of the measures set out in Annex I to Directive 2009/72 to customers other than household customers, the provisions whose interpretation is sought preclude, as a matter of principle, national legislation such as that described in paragraph 31 above. By contrast, it follows, in essence, from that context that such national legislation must ensure that customers have the right to choose their supplier and that consumers are informed in a clear and comprehensible manner of their rights and are able to enforce them in the context of a dispute settlement mechanism.