Gloria, an employee of Bargello Inc. and an active member of the company's union, is elected as the representative of Bargello's unionized workers. She represents employees at the workplace and discusses their grievances with HR managers. In this scenario, Gloria is most likely

a$.$ a line manager in the company

b$.$ the union steward of the company's union

c$.$ the union arbitrator of the company's union

d$.$ an operating manager in the company