What is the standard for dismissing a frivolous claim?

1 Because the district court did not state whether these claims were dismissed as frivolous or for failure to state a claim, the standard is either abuse of discretion, see Trimble v. City of Santa Rosa, 49 F.3d 583, 585 (9th Cir.1995), or de novo, see Barnett v. Centoni, 31 F.3d 813, 816 (9th Cir.1994) (per curiam). Under either standard, the district court did not err.