Member States shall take the necessary measures to ensure that workers, services or persons designated, in accordance with Article 7 of Directive 89/391/EEC, to carry out activities related to protection from and prevention of occupational risks are informed of the assignment of workers with an employment relationship as referred to in Article 1, to the extent necessary for the workers, services or persons designated to be able to carry out adequately their protection and prevention activities for all the workers in the undertaking and/or establishment.