A company IT department would be permitted to monitor the computer usage of a company employee under which of the following circumstances?

An IT worker is helping a friend by monitoring one individual employee's computer usage to find out if she is cheating on the friend

The IT department is monitoring usage simply because it can; it would not be able to give any legitimate business reason for the monitoring

The employee's supervisor wants to get an idea of how many hours per day the employee is spending on the computer

The company has a proper motive but does not notify employees that their usage will be monitored