What Is Meant by "Significant Modeling by Managers

What is meant by "significant modeling by managers?"

A) Emphasize on teaching employees to have a good attitude.
B) Managers demonstrating the behavior that they intend to reward employees for performing.
C) Clearly defining the skills the service person must bring to the job.
D) Conveying a clear, concrete message that explains the service strategy that frontline people can begin to act on.