Is a motion to dismiss based on a prisoner's failure to exhaust administrative remedies properly the subject of a motion under Federal Rule of Civil Procedure 12(b)?

A motion to dismiss based on a prisoner's failure to exhaust administrative remedies is properly the subject of an unenumerated motion under Federal Rule of Civil Procedure 12(b). See Wyatt v. Terhune, 315 F.3d 1108, 1119 (9th Cir. 2003). "In deciding a motion to dismiss for failure to exhaust non-judicial remedies, the court may look beyond the pleadings and decide disputed issues of fact." Id. at 1119-20. Where the court looks beyond the pleadings to a factual record in deciding the motion to dismiss, which is "a procedure closely

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