A friend who works for a company with hundreds of full$-$time employees tells you she showed up for work this morning and received a layoff slip. She says over $500$ employees were laid off in total, and she says her employer gave no warning. This employer has violated which of the following laws?

Group of answer choices

the Taft$-$Hartley Act

the Worker Adjustment and Retraining Notification Act

the Governmental Adjustment Act

the Civil Service Reform Act