; (B) engaged in vocational, technical, or workforce development training or in an apprenticeship, on a full-time basis, as classified by a vocational, technical, or workforce development training institution or entity; (C) enrolled in a secondary school, an institution of higher education, or other institution providing post-secondary education, on a full-time basis, as classified by an educational institution; or (D) engaged in a combination of activities described in subparagraphs (A), (B), and (C) to such an extent that, in the aggregate, the engagement is on a full-time basis. (2) Verification The Secretary shall require a public housing agency or project owner, as applicable, to annually verify compliance with the requirement under paragraph (1) by each person occupying a dwelling unit assisted or administered by the agency or owner, as applicable, pursuant to a preference for housing assistance in conjunction with reviews of income for purposes of determining eligibility for assistance described in subsection (a). (3) Exceptions The requirement under paragraph (1) shall not apply to— (A) a person physically or mentally unfit for employment, as determined in accordance with such standards as the Secretary shall establish; (B) a parent or other household member responsible for the care of a dependent child under 6 or an incapacitated person