Final answer:
Under the Worker Adjustment and Retraining Notification (WARN) Act, an employer that is ceasing to do business without a successor employer must provide written notice to affected current employees at least 60 days before closing, including information about their right to access their medical and exposure records.
Step-by-step explanation:
Under the Worker Adjustment and Retraining Notification (WARN) Act, an employer that is ceasing to do business without a successor employer must provide written notice to affected current employees at least 60 days before closing. This notice should inform the employees of their right to access their medical and exposure records. Therefore, the correct answer to this question is b. 60 days.