Which action is prohibited against an employee who makes a complaint about required overtime?

The correct action that is prohibited against an employee who makes a complaint about required overtime is discharging or discriminating against the employee. This is rooted in labor laws and workplace protections that safeguard employees from retaliation when they assert their rights regarding working conditions, including disputes over overtime requirements.

When an employee raises a complaint or concern about required overtime, they are engaging in a protected activity. Discharging or discriminating against this employee for voicing such concerns is deemed retaliatory behavior, which is illegal. The intent of these legal protections is to encourage a safe and open environment where employees can voice concerns without fear of negative consequences.

In contrast, actions like promoting the employee, changing their shift hours, or reassigning them to a different role could potentially be considered acceptable, depending on the context and the legitimate reasons behind those actions. However, retaliation in the form of discriminatory practices or termination directly violates employee rights and is therefore explicitly prohibited.