The employee is informed of the legal action envisaged by the representative trade union organisation in application of article L. 1265-1 by any means capable of conferring a date certain. This information specifies the nature and purpose of the action envisaged by the trade union organisation and indicates that :
1° The employee may inform the trade union organisation of his opposition to the planned action within a period of fifteen days from the date of receipt of the letter ;
2° The trade union organisation may itself take recourse action;
3° The employee may, at any time, intervene in the proceedings initiated by the trade union organisation.