What is the difference between vertical and horizontal choice of law? Question 1 options: a) Vertical choice of law is when a federal court decides an issue that affects the federal courts above it. Horizontal is when the decision affects federal courts in the same state. b) Vertical choice of law is when a federal court decides whether to apply state law or federal law to an issue. Horizontal is when the federal court decides which state's law to apply when more than one state's law is at issue. c) Vertical choice of law is when federal courts apply federal law over state law. Horizontal choice of law is when state courts apply federal law. d) None of the above