Which level of government (national, state, or local) is most restricted by the constitution's supremacy clause?

Ablank relationship exists between an employee and a supervisor

Which of the following is a personal responsibilty

Annie and bart are coworkers. in fact, they share a cubicle wall. recently, they were involved in a fender-bender in the company parking lot. each blames the other for the accident, and the two have stopped speaking. would you advise them to try to settle their dispute through arbitration, mediation, or with a traditional lawsuit? why?