Final answer:
Showing enthusiasm and energy is a suitable strategy when interacting with a customer exhibiting an expressive behavioral style as a service employee.
Step-by-step explanation:
When interacting with a customer exhibiting an expressive behavioral style, the most suitable strategy as a service employee would be to show enthusiasm and energy. This is because expressive individuals are often outgoing, energetic, and responsive to enthusiastic interactions. By demonstrating a similar level of enthusiasm and energy, the service employee can establish a positive rapport and engage the customer effectively.