22. A state statute requires amusement park owners to maintain their equipment in specific condition for the protection of their patrons. Ed, who owns an amusement park, fails to adhere to the requirements of the statute. As a direct result of this failure, Fran, a patron, is injured. Fran sues Ed under a theory of negligence. In an effort to prove Ed breached his duty,r of care, Fran's best theory would be: custom or usage. res ipsa loquitur. negligence per se. diversity of citizenship. P'FP'P