A statute of the state of Tuscarora made it a misdemeanor to construct any building of more than five stories without an automatic fire sprinkler system. A local construction company built a 10-story federal office building in Tuscarora. It constructed the building according to the precise specifications of a federal contract authorized by federal statutes. Because the building was built without the automatic fire sprinkler system required by state law, Tuscarora decided to prosecute the private contractor. Which of the following is the company's strongest defense to that prosecution?
The state sprinkler requirement denies the company property or liberty without due process. The state sprinkler requirement denies the company equal protection of the laws As applied, the state sprinkler requirement violates the supremacy clause.  As applied, the state sprinkler requirement violates the obligation of contracts clause.