; and (bb) shall be reviewed by the multidisciplinary staff committee every 3 days during the period of the extension, in order to confirm the continued existence of the substantial and immediate threat; (B) limit disciplinary segregation— (i) to situations in which such segregation is necessary to address an inmate who has been found to have committed a significant and serious disciplinary infraction by a disciplinary hearing officer and poses an ongoing significant and serious threat, and alternative sanctions would not adequately regulate the behavior of the inmate; (ii) in the case of a prohibited act categorized as a 400-level prohibited act under section 541.3 of title 28, Code of Federal Regulations, or any successor thereto, by prohibiting the use of disciplinary segregation; (iii) in the case of a prohibited act categorized as a 300-level prohibited act under section 541.3 of title 28, Code of Federal Regulations, or any successor thereto, by— (I) prohibiting the use of disciplinary segregation for the first such prohibited act; and (II) limiting disciplinary segregation to a duration of not more than 15 days, for a second or subsequent such prohibited act; (iv) in the case of a prohibited act categorized as a 200-level prohibited act under section 541.3 of title 28, Code of Federal Regulations, or any successor thereto, by— (I) limiting disciplinary segregation to a duration of not more than 30 days, for the first such prohibited act; and (II) limiting disciplinary segregation to a duration of not more than 60 days, for a second or subsequent such prohibited act; (v) in the case of a prohibited act categorized as a 100-level prohibited act under section 541.3 of title 28, Code of Federal Regulations, or any successor thereto, by— (I) limiting disciplinary segregation to a duration of not more than 60 days, for the first such prohibited act; and (II) limiting disciplinary segregation to a duration of not more than 90 days, for a second or subsequent such prohibited act