How does the $$Weingarten Right$$ impact the progressive discipline process for unionized employees?

a$.$ If the employee is protected by a union, it allows the employee to have union representation during any investigative interviews

b$.$ It allows the employee to skip disciplinary action because they are represented by a union

c$.$ Employees may not be disciplined unless the employer contacts the union first.

d$.$ It allows the employee to skip the interview process