1. Member States shall provide for any transfer by competent authorities of personal data which are undergoing processing or are intended for processing after transfer to a third country or to an international organisation including for onward transfers to another third country or international organisation to take place, subject to compliance with the national provisions adopted pursuant to other provisions of this Directive, only where the conditions laid down in this Chapter are met, namely:

(a) the transfer is necessary for the purposes set out in Article 1(1);

(b) the personal data are transferred to a controller in a third country or international organisation that is an authority competent for the purposes referred to in Article 1(1);

(c) where personal data are transmitted or made available from another Member State, that Member State has given its prior authorisation to the transfer in accordance with its national law;