for providing a decision until the arguments have been received, or the deadline for their presentation has passed. 4. When the information being requested, even if it is in the possession of the body addressed, has been drafted or generated mainly or in its entirety by a third party, the request shall be sent to said third party for a decision on access. Article 20. Decisions. 1. Decisions in which access is granted or denied must be sent to the applicant and to those affected third parties that have so requested within a maximum of one month after receipt of the request by the body responsible for taking a decision. This period may be extended by another month if the volume or complexity of the information requested so necessitates, and after notifying the applicant. 2. Decisions denying access shall provide justifying motives, as shall those granting partial access or access in a manner different from that requested, as well as those decisions permitting access when a third party has opposed, in which case, the interested party shall be expressly informed that access may only take place after the period specified in Article 22.2. 3. When the mere indication of the existence or non-existence of certain information would lead to violating any of the limits to access, this circumstance shall be indicated when denying the request. 4. After the deadline for a decision has passed, without a specific decision being made and notified, the request shall thereafter be considered to have been denied. 5. Decisions regarding access to public information may be appealed directly to an Administrative Court, notwithstanding the possibility of lodging the optional appeal stipulated in Article 24. 6. Repeated non-compliance with the obligation to take decisions within a certain number of days shall be considered a serious infraction insofar as application of the disciplinary system set forth in the corresponding regulations to those responsible is concerned. Article 21. Information units. 1. The Public Administrations included within the scope of application of this Title shall establish systems to integrate the management of information requests from the public into their international organization. 2. At the level of the Central State Administration, there shall be special units with the following responsibilities: a) Collecting and disseminating the information cited in Chapter II of Title I of this Act. b) Receiving and processing requests for access to information. 18