After reviewing an administrative agency's regulation, a federal court ruled that the regulation was unlawful because it violated the United States Constitution. The federal court's ruling is an example of what type of law

Common Law

Explanation:

The case shown in the question above is an example of Common Law, which is the concept that establishes the creation of a legal system that comes to the conclusion of situations based on concepts created within other legal cases and not on concepts created through laws and codes. This type of system is done with the exclusive participation of judges and lawyers, to ensure that no law is being changed or disrespected.

the first part of the statute of limitations is the standard deadline, which gives victims of medical malpractice a certain number of years -- usually anywhere from two to six years, depending on the state -- after the malpractice occurred within which to file a lawsuit.

"quid pro quo" harassment takes place when a supervisor requires sex, sexual favors, or sexual contact from an employee/job candidate as a condition of their employment. only supervisors who have the authority to make tangible employment actions (i.e. hire, fire, promote, can commit "quid pro quo" harassment.