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