1. A group-level resolution authority, together with the resolution authorities of subsidiary undertakings, after having consulted the college of supervisors established in accordance with Article 248 of Directive 2009/138/EC, shall consider the assessment referred to in Article 14 within the resolution college and shall take all reasonable steps to reach a joint decision as referred to in Article 17 on the application of measures identified in accordance with Article 15(4) in relation to all relevant group entities.