With no explanation, chose the best option from "A", "B", "C" or "D". 304 U.S. 64, 78, 58 S.Ct. 817, 822, 82 L.Ed. 1188 (1938). State statutes of limitations also apply in diversity cases. Guaranty Trust Co. v. York, 326 U.S. 99, 109-10, 65 S.Ct. 1464, 1469-70, 89 L.Ed. 2079 (1945). In Ragan v. Merchants Transfer & Warehouse Co., 337 U.S. 530, 533, 69 S.Ct. 1233, 1234-35, 93 L.Ed. 1520 (1949), the Court rejected the argument that Federal Rule 3 governs the time in which actions are commenced in federal court for purposes of tolling state statutes of limitations. Instead, the Court held that state service of summons statutes supply the applicable rule. Id. at 533-34, 69 S.Ct. at 1234-35. If a valid Federal Rule of Civil Procedure addresses an issue, however, contrary state rules may be ignored. Hanna v. Plumer, 380 U.S. at 474, 85 S.Ct. at 1145-46 (<HOLDING>). See also id. at 476, 85 S.Ct. at 1146-47

A: holding service requirements under fedrcivp 4 to be jurisdictional
B: holding that in a diversity action a federal court must apply the law of the forum state
C: holding that fedrcivp 4d1 governs the method of service of process in a diversity action
D: holding that actual notice of lawsuit is no substitute for substantial compliance with frcp 4d1 requiring service on person of defendant on suitable resident at defendants dwelling or on defendants agent a  judgment entered by a court which lacks jurisdiction over the person of the defendant is void and may be set aside at any time pursuant to fedrcivp 60b4 personal jurisdiction is established either by proper service of process or by the defendants waiver of any defect in the service of process
C.