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Bob demonstrates to trainees how to handle angry customers who call the firh's help line. Each trainee is then assigned a role to play in a simulated telephone conversation to help the trainees practice the proper communication skills. Finally, trainees are given feedback on their performance during the role play. Which training technique is Bob most likely using?

a$.$ vestibule training

b$.$ informal learning

c$.$ behavior modeling

d$.$ apprenticeship training