(48)In the case of groups with diversified activities where parent undertakings control at least one subsidiary, the competent authorities should be able to assess the financial situation of each credit institution or investment firm in such a group. The competent authorities should at least have the means of obtaining from all undertakings within a group the information necessary for the performance of their function. Cooperation between the authorities responsible for the supervision of different financial sectors should be established in the case of groups of undertakings carrying out a range of financial activities.