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?

Group of answer choices

Applying for arbitration to settle the grievance

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

Discussing the grievance with her union steward and supervisor

Setting up an impartial third party to resolve the grievance