Question: Dan is visiting his parents for the weekend. There is a knock at the door. He answers it and is handed a complaint and summons for a lawsuit brought against him by Paul. Which of the following is true? Question options: a) Service is not proper because Dan's parents' house is not his dwelling or usual place of abode. b) Service is not proper because Dan is under 18. c) Service is proper under FRCP 4. d) Service is proper under state law.