Which of the following is the most accurate statement of the court's holding in Allen v. Sybase, Inc., 468 F.3d 642 (10th Cir. 2006)? Question 9 options: a) When an employer foresees it could lay off enough employees to constitute a mass layoff under Worker Adjustment and Retraining Notification (WARN) Act, the employer must provide its employees with sixty days' advance notice. b) When an employer foresees it could lay off enough employees to constitute a mass layoff under Worker Adjustment and Retraining Notification (WARN) Act, the employer must provide its employees with thirty days' advance notice. c) When an employer foresees it could lay off enough employees to constitute a mass layoff under Worker Adjustment and Retraining Notification (WARN) Act, the employer must provide its employees with ten days' advance notice. d) None of the above