the functions thereof referred to in Paragraph (1), the Commission shall respect the principles of objectivity, transparency, proportionality, and non-discrimination. Article 167. (1) (Amended, SG No. 105/2011, effective 29.12.2011) The obligation to ensure transparency shall involve publication of specified information such as: financial statements, technical specifications, network characteristics, terms and procedure for provision of access and/or interconnection, terms of use, prices, conditions limiting access to and/or use of services and applications. (2) The Commission may specify the content of the information which must be published, the level of detail required, and the manner of publication, taking into consideration the need to safeguard business secrets. (3) In case where, besides the obligation referred to in Paragraph (1), an obligation of non-discrimination has been imposed on an undertaking referred to in Article 166 (1) herein, the Commission may require that the said undertaking publish a reference offer. The reference offer may include: 1. conditions for interconnection and access: (a) description of the services related to interconnection and access for each of the networks, conditions and lead times for provision of the said services; (b) location of the points of interconnection or access, conditions and lead times for opening and/or closing of the said points; (c) (amended, SG No. 105/2011, effective 29.12.2011) network elements whereto access is offered; (d) standards and quality requirements; (e) other relevant information necessary for use of the service; 2. co-location services: (a) (supplemented, SG No. 105/2011, effective 29.12.2011) information about the sites where co-location is offered and planned changes; availability of this information could be restricted to interested parties only, in order to ensure network security; (b) co-location options, including physical co-location and, if possible, distant co-location and virtual co-location; (c) (repealed, SG No. 105/2011, effective 29.12.2011); (d) characteristics of and technical restrictions on the facilities which can be co-located; (e) security measures; (f) access conditions for staff of competitive undertakings; (g) safety standards; (h) rules for the allocation of space, where co-location space is limited; (i) conditions for examination, on the part of competitive undertakings, of sites, where co-location is possible or sites where co-location was refused on grounds of lack of capacity; 3. conditions included in the contracts for access and interconnection: (a) (supplemented, SG No. 105/2011, effective 29.12.2011) lead time for responding to requests for supply of services, lead time for supply of the services, lead time and procedures for fault resolution, service level agreements, procedures to return to a normal level of service and quality of service parameters; (b) standard contract terms, including, where appropriate, compensation for failure to meet lead times for provision of services; (c) conditions for provision of the service of carrier selection on a call-to-call basis or by means of pre-selection; (d) conditions for number portability; (e) prices and pricing mechanism; (f) other relevant information necessary for use of the service;