Final answer:
The question seems to confuse CNWDI with employment law, but it actually refers to the WARN Act, which mandates a 60-day notice from large employers for plant closings or layoffs.
Step-by-step explanation:
The phrase CNWDI, which stands for Critical Nuclear Weapon Design Information, is actually not related to employment law or the requirement of employers to provide notice before layoffs or plant closings. Rather, it pertains to a security classification in the context of national security.
However, the information provided relates to a U.S. federal law known as the Worker Adjustment and Retraining Notification (WARN) Act, which indeed requires employers with more than 100 employees to give a written notice at least 60 days in advance of plant closings or large layoffs.
The purpose of this notice is to ensure that employees have sufficient time to prepare for the transition and seek other employment or retraining opportunities. The WARN Act is designed to protect workers and their families from sudden and unexpected employment disruptions.