4. Without prejudice to the applicability of this article to all regulatory measures, the Authority shall consult with persons who may be affected by a regulatory measure in those cases expressly set forth in the present Decree-Law, and it shall: a) Provide prior written notice of the proposed regulatory measure, explaining the reasons for the proposed regulatory measure and setting out the procedure for making any representations; b) Grant a reasonable period which, save in duly justified exceptional circumstances, shall be no less than 30 days, to present representations to the Authority; c) Consider any representations made; d) Provide reasons for the proposed significant changes to the regulatory measure when such are made; and e) Where such regulatory measure involves various service providers or significant public interest, apply the requirements of this provision through a public consultation process in which any person may participate. 5. The Authority shall ensure that all regulatory measures: a) Are made in writing and substantiated and supported by the reasons provided for making the regulatory measure; b) Are based on, and give effect to, the provisions of the present Decree-Law, and refer to the provisions on which they are based; c) Are objective; d) Are transparent; e) Do not discriminate against affected persons unduly; f) Constitute an adequate solution to the problem they seek to address; g) Are proportionate to, and justified by, their specific purpose pursuant to the present Decree-Law and, generally, the objective provided for in Article 2; and h) Set a reasonable time for compliance. 6. The Authority shall resort to a legal counselor to ensure that regulatory measures fall within its functions, responsibilities and powers pursuant to the present Decree-Law and such consultation shall be subject to secrecy and to the rules governing protection of confidentiality and attorney-client privilege.