(a) Unless the citation or court order otherwise directs, the citation must be served by: (1) delivering to the defendant, in person, a copy of the citation, showing the delivery date, and of the petition; or (2) mailing to the defendant by registered or certified mail, return receipt requested, a copy of the citation and of the petition. (b) Upon motion supported by a statement-sworn to before a notary or made under penalty of perjury-listing any location where the defendant can probably be found