(a) the conviction to be replaced by a youthful offender finding is for (i) a class A-I or class A-II felony, or (ii) an armed felony as defined in subdivision forty-one of section 1.20, except as provided in subdivision three, or (iii) rape in the first degree, criminal sexual act in the first degree, or aggravated sexual abuse, except as provided in subdivision three, or

(b) such youth has previously been convicted and sentenced for a felony, or

(c) such youth has previously been adjudicated a youthful offender following conviction of a felony or has been adjudicated on or after September first, nineteen hundred seventy-eight a juvenile delinquent who committed a designated felony act as defined in the family court act. 3. Notwithstanding the provisions of subdivision two, a youth who has been convicted of an armed felony offense or of rape in the first degree, criminal sexual act in the first degree, or aggravated sexual abuse is an eligible youth if the court determines that one or more of the following factors exist: (i) mitigating circumstances that bear directly upon the manner in which the crime was committed; or (ii) where the defendant was not the sole participant in the crime, the defendant's participation was relatively minor although not so minor as to constitute a defense to the prosecution. Where the court determines that the eligible youth is a youthful offender, the court shall make a statement on the record of the reasons for its determination, a transcript of which shall be forwarded to the state division of criminal justice services, to be kept in accordance with the provisions of subdivision three of section eight hundred thirty-seven-a of the executive law. 4. "Youthful offender finding" means a finding, substituted for the conviction of an eligible youth, pursuant to a determination that the eligible youth is a youthful offender. 5. "Youthful offender sentence" means the sentence imposed upon a youthful offender finding. 6. "Youthful offender adjudication". A youthful offender adjudication is comprised of a youthful offender finding and the youthful offender sentence imposed thereon and is completed by imposition and entry of the youthful offender sentence.