Problem: P sued D in federal court in State X for breach of contract. State X law permits service of process to be completed by first class mail. P mailed the summons and complaint to D by first-class mail. Was service of process proper? Question options: a) Yes, because the federal rules of civil procedure require D to waive formal service requirements. b) Yes, because the federal rules of civil procedure permit service to be completed by following the laws of the state where the lawsuit was filed. c) No, because the federal rules of civil procedure do not permit service by first class mail. d) No, because the federal rules of civil procedure require in hand service if formal service requirements are not waived.