What is the test for reducing a crime to a misdemeanor under section 17, subdivision (b) of the California Criminal Code?

Section 17, subdivision (b) authorizes the reduction of "wobbler" offensescrimes that, in the trial court's discretion, may be sentenced alternatively as felonies or misdemeanors. "[T]he court may reduce a wobbler to a misdemeanor either by declaring the crime a misdemeanor at the time probation is granted, or at a later timefor example when the defendant has successfully completed probation." (People v. Park (2013) 56 Cal.4th 782, 793; 17, subd. (b)(3).) Assault with a deadly weapon, the crime of

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which defendant was convicted, is a wobbler offense. ( 245, subd. (a)(1); People v. Park, at p. 790.)