Implementation of collective redundancies. If, in the opinion of the employer, collective redundancies are unavoidable even though the intention is to re-engage part of the employees without their stopping work completely, then the aim shall be that a decision on which of the employees are to be offered re-engagement should be made as soon as possible. Where no decision has been made on re-engagement and the employee is informed that he cannot be re-engaged, and this is done sufficiently early in the process so that at least 2/3 of the notice period applying to the employee in question remains, then the notice period shall be extended by one month in the case of a three-month notice period, by three weeks in the case of a two-month notice period and by two weeks in the case of a one-month notice period. This provision applies to employees who have acquired the right to a notice period of at least one month. Notwithstanding the provisions of this section, an announcement of re-engagement may, in the event of external circumstances that are beyond the employer’s control, be made subject to the condition that the employer will be able to continue the activities for which the employee is engaged, without this resulting in an extension of the notice period.