Amanda is suspended by her manager for refusing to work the night shift. She decides to file a grievance with the HR unit in her company. Which of the following should be Amanda's first step?

a. Setting up an impartial third party to resolve the grievance

b. Discussing the grievance with her union steward and supervisor

c. Applying for arbitration to settle the grievance

d. Filing a written complaint with the U.S. secretary of labor