(1) A competent authority may request a competition authority of another Member State to notify an undertaking or association of undertakings, on behalf of the competent authority, of -

(a) any preliminary objections that the undertaking or association of undertakings has infringed relevant competition law, or any decisions made by an adjudication officer under section 15X that an infringement of relevant competition law has occurred or is occurring,

(b) any procedural act adopted in the context of enforcement proceedings which the undertaking or association of undertakings concerned is entitled to be notified of under the law of the State, and

(c) any relevant document, including documents which relate to the enforcement of decisions imposing administrative financial sanctions or periodic penalty payments, related to the application of relevant competition law insofar as the documents concern an infringement by the undertaking or association of undertakings referred by the competent authority.