2. Prior to approving or altering any regulation the issue of which falls within its competency, ARCOM shall notify the relevant Minister, concessionaires or licensed entities, operators, and other registered service providers, as well as consumer associations of a generic or specific interest in the area of communications, granting them access to the respective texts and making these available on its website. 3. For the purposes of the preceding subsection, persons concerned may make comments and put forward suggestions within 30 days. 4. The entities contemplated in subsection 11.2 above may have access to every suggestion that may have been put forward under the terms as established by this section. 5. The preamble to a regulation shall substantiate the decisions made, with the necessary reference to criticisms or suggestions that may have been made in connection with its draft. 6. ARCOM regulations containing external effectiveness norms are published in the Official Gazette and made available on the respective website, without prejudice to their publication by other means deemed more adequate to a given situation. 7. ARCOM regulations, which simply aim to regulate procedures of an in-house nature of one or more categories of service operators or providers, are referred to as Instructions, the respective addressees, where identifiable, are given notice thereof and such regulations enter into force five days after the notice has been served or on the date mentioned therein. Section 12 Exercising supervision 1. Under the terms as established by law, ARCOM may, in the fulfilment of its functions, conduct inquiries and investigations in any entity or facilities. 2. For the purposes of the preceding subsection, ARCOM may credential especially qualified and competent persons or entities. Section 13 Obligations of operators 1. Concessionaires or licensed entities, operators and all other registered service providers shall extend to ARCOM all such co-operation as the latter may request them in order to fully perform its functions, notably requested information and documents, which shall be provided not later than 10 days, except where a shorter deadline is set on grounds of urgency. 2. ARCOM may publicise information so obtained, whenever relevant to the regulation of the sector, except where such information is of a sensitive nature to the entities concerned.