Mary and Hanna, who are Tennessee residents, were traveling through Mississippi when they were involved in an automobile accident with Franco, who is a resident of Mississippi. Franco sues Mary, who was driving the car, in federal court in Mississippi and asks for $$100,000$ to reimburse him for his medical bills and lost wages. In decidin the case, what law will the federal district judge apply?

state law

federal law

U$.$S$.$ Supreme Court case law

either state law or federal law