1. The relevant competent authorities shall work in full consultation with each other when carrying out the assessment if the proposed acquirer is one of the following:
(a) a credit institution, assurance undertaking, insurance undertaking, reinsurance undertaking, investment firm or management company within the meaning of Article 1a, point 2 of Directive 85/611/EEC (hereinafter referred to as the UCITS management company) authorised in another Member State or in a sector other than that in which the acquisition is proposed;
(b) the parent undertaking of a credit institution, assurance undertaking, insurance undertaking, reinsurance undertaking, investment firm or UCITS management company authorised in another Member State or in a sector other than that in which the acquisition is proposed; or
(c) a natural or legal person controlling a credit institution, assurance undertaking, insurance undertaking, reinsurance undertaking, investment firm or UCITS management company authorised