A plaintiff serves a defendant by first-class mail at the defendant's last known address without court authorization. Under FRCP Rule 4(e), is this service valid?
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A
Yes, if the defendant actually receives the mail
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B
Yes, because mail is always a permissible federal service method
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C
No, FRCP Rule 4(e) does not authorize first-class mail service by itself as a federal method
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D
Yes, if the plaintiff files proof of mailing with the court within 10 days