All requests for information, acknowledgements of receipt and replies to requests for information referred to in Articles 3 and 4 shall comply with the following rules:
((a))
they shall be in writing;
((b))
they shall be sent by post or fax, or by an electronic means that is capable of ensuring the completeness, integrity and confidentiality of the information throughout the transmission process;
((c))
they shall be addressed:
((i))
in the case of a request sent to a competent authority, to the contact person designated by the competent authority under Article 7;
((ii))
in the case of an acknowledgement of receipt or a reply sent to ESMA, to the contact point specified by ESMA in its request for information.