(28)To ensure that the Authority can fulfil its supervisory obligations in an efficient manner with regard to selected obliged entities, the Authority should be able to obtain any internal documents and information necessary for the exercise of its tasks and for that purpose have the general investigation powers afforded to all supervisory authorities under national administrative law. To that end, the Authority should be able to address information requests to the selected obliged entity, to natural persons employed by it, to legal persons belonging to it and to parties contracted by it, such as: the obliged entity itself or any legal person within the obliged entity; employees of the obliged entity and persons in comparable positions, including agents and distributors; external contractors; and third parties to whom a selected obliged entity has outsourced its activities.