1. Those Member States which intend to make use of the option provided for in this Directive shall bring into force the provisions necessary for them to comply with this Directive at any time after its publication. They shall forthwith inform the Commission thereof.
2. When the Member States adopt those measures they shall contain a reference to this Directive or shall be accompanied by such a reference on the occasion of their official publication. The methods of making such a reference shall be laid down by the Member States.
3. The Member States shall communicate to the Commission the texts of the main laws, regulations and administrative provisions of national law which they adopt in the field covered by this Directive.