Filing workers' compensation claims, serving on juries, refusing to commit perjury, whistle-blowing—all these fall under the category of and cannot legally be the basis for discharge.

All these fall under the category of public policy and cannot legally be the basis for discharge.

Explanation:

Public policy can be understood as the concepts in which laws are based, which are frequently unwritten.

In this case, we can see that filling workers' compensation claims, serving on juries, refusing to commit perjury and whistle-blowing are all morally correct; these acts are based on the law and they cannot legally be bias for discharge.