How might an interactive leader like Mary Barra communicate a policy change that impacts all GM employees from executive-level managers to assembly line workers

a. Create task forces at different levels of the organization that communicate the benefits of the policy change

c. Hold a series of town hall meetings to discuss the policy change and listen to employee concerns

d. Hold informal meetings with key managers, department heads, and staff employees to discuss the policy change to develop best practices for communicating the change to other employees

Explanation:

Creating a task force at different levels in GM whose sole purpose is to communicate the new policy change and all the effects it would have will ensure that employees at all levels have a better chance of learning of the changes.

Also by holding a series of Town Hall meetings where employees can voice concerns to Mary Barra and other top executives for clarification would be very useful in the drive to helping the employees learn more about the policy change because they will hear it "from the horse's mouth" so to speak.

Informal meetings with front-line and other leaders in the company about the change can go a long way in the information being disseminated as the leaders will take the information back to their subordinates and will be more informed as to how to clarify concerns they may have.