4. Without prejudice to Article 346 TFEU, information that is confidential pursuant to Union or national rules, such as rules on business confidentiality, shall be exchanged with the Commission and other relevant authorities in accordance with this Directive only where that exchange is necessary for the application of this Directive. The information exchanged shall be limited to that which is relevant and proportionate to the purpose of that exchange. The exchange of information shall preserve the confidentiality of that information and the security and commercial interests of critical entities, while respecting the security of Member States.