Final answer:
Theresa should advise her boss to comply with OSHA regulations by displaying the injury and illness summary data in a prominent location if they have 10 or more employees. Failure to do so could lead to violations and fines.
Step-by-step explanation:
Theresa should inform her boss that, according to Occupational Safety and Health Administration (OSHA) regulations, posting requirements call for the display of the injury and illness summary data in a prominent location if there are 10 or more employees on the payroll. This summary must be posted annually and be easily accessible to all employees, not hidden away on the back of a closet door or in a binder in the HR manager's office. Furthermore, the report needs to be posted in an area where notices to employees are customarily placed and should remain posted for a period of three months. It is also important to be clear about the responsibility an employer has to provide a safe workplace and ensure that workers can exercise their rights under the law without fear of retaliation.