; (C) a prisoner who has successfully completed all recidivism reduction programming to which the prisoner was assigned shall participate in productive activities, including a prison job; and (D) to the extent practicable, each eligible prisoner shall participate in and successfully complete recidivism reduction programming or productive activities, including prison jobs, throughout the entire term of incarceration of the prisoner. (5) Mentoring services Any person who provided mentoring services to a prisoner while the prisoner was in a penal or correctional facility of the Bureau of Prisons shall be permitted to continue such services after the prisoner has been transferred into prerelease custody, unless the person in charge of the penal or correctional facility of the Bureau of Prisons demonstrates, in a written document submitted to the person, that such services would be a significant security risk to the prisoner, persons who provide such services, or any other person. (6) Recidivism reduction program incentives and rewards Prisoners who have successfully completed recidivism reduction programs and productive activities shall be eligible for the following: (A) Time credits (i) In general Subject to clauses (ii) and (iii), a prisoner who has successfully completed a recidivism reduction program or productive activity that has been certified under paragraph (2)(B) shall receive time credits of 5 days for each period of 30 days of successful completion of such program or activity. A prisoner who is classified as low risk shall receive additional time credits of 5 days for each period of 30 days of successful completion of such program or activity. (ii) Availability A prisoner may not receive time credits under this subparagraph for successfully completing a recidivism reduction program or productive activity— (I) before the date of enactment of this subsection