; (B) secured or unsecured release on bond; or (C) participation in a program described in subsection (d). (2) Monthly review Any condition assigned to an alien under paragraph (1) shall be reviewed by an immigration judge on a monthly basis. (c) Special rule for vulnerable persons and primary caregivers (1) In general In the case that the alien who is the subject of a custody determination under this section is a vulnerable person or a primary caregiver, the alien may not be detained unless the Secretary demonstrates, in addition to the requirements under subsection (a)(2), that it is unreasonable or not practicable to place the individual in a community-based supervision program. (2) Definitions In this subsection: (A) Material witness The term material witness means an individual who presents a declaration to an attorney investigating, prosecuting, or defending the workplace claim or from the presiding officer overseeing the workplace claim attesting that, to the best of the declarant’s knowledge and belief, reasonable cause exists to believe that the testimony of the individual will be relevant to the outcome of the workplace claim. (B) Primary caregiver The term primary caregiver means a person who is established to be a caregiver, parent, or close relative caring for or traveling with a child. (C) Vulnerable person The term vulnerable person means an individual who— (i) is under 21 years of age or over 60 years of age; (ii) is pregnant; (iii) identifies as lesbian, gay, bisexual, transgender, or intersex; (iv) is a victim or witness of a crime; (v) has filed a nonfrivolous civil rights claim in Federal or State court; (vi) has filed, or is a material witness to, a bonafide workplace claim; (vii) has a serious mental or physical illness or disability; (viii) has been determined by an asylum officer in an interview conducted under section 235(b)(1)(B) to have a credible fear of persecution or torture