Where should a pesticide applicator keep the National Poison Control Center toll-free number?

The correct choice emphasizes the importance of having immediate access to the National Poison Control Center toll-free number in multiple key locations related to pesticide application. Keeping the number in the service truck ensures that it is available in the field for quick reference in case of an emergency. Storing the number where pesticides are kept is critical for addressing any potential exposure or accidents that could occur during storage. Similarly, posting the number where pesticides are mixed is vital, as this area poses a high risk for spills or contact with chemicals. Having this information readily available in all these locations enhances safety measures and ensures a rapid response in the event of chemical exposure or emergency situations. This comprehensive approach underscores the necessity of preparedness and reinforces the safety protocols in pesticide handling and application.