; retrospective adjustment The Secretary shall make a payment under paragraph (1) or (2) for a year on the basis of advance estimates of expenditures submitted by the State and such other investigation as the Secretary may find necessary, and shall reduce or increase the payment as necessary to adjust for any overpayment or underpayment for a previous year. (c) State activities A State that receives a payment under subsection (b) shall carry out all of the following activities: (1) State administration of the State preschool program described in this section. (2) Supporting a continuous quality improvement system for providers of preschool services participating, or seeking to participate, in the State preschool program, through the use of data, research, monitoring, training, technical assistance, professional development, and coaching. (3) Providing outreach and enrollment support for families of eligible children. (4) Supporting data systems building. (5) Supporting staff of eligible providers through professional development and coaching, and supporting staff in pursuing credentials and degrees, including baccalaureate degrees. (6) Supporting activities that ensure access to inclusive preschool programs for children with disabilities. (7) Providing age-appropriate transportation services for children, which at a minimum shall include transportation services for children experiencing homelessness and children in foster care. (8) Conducting or updating a statewide needs assessment of access to high-quality preschool services. (d) Lead agency The Governor of a State desiring for the State to receive a payment under this section shall designate a lead agency (such as a State agency or joint interagency office) for the administration of the State's preschool program under this section. (e) State plan In order to be eligible for payments under this section, the Governor of a State shall submit a State plan to the Secretary for approval by the Secretary, in collaboration with the Secretary of Education, at such