; (2) are notified they may participate in a challenge process to address claims about the eligibility of the area for a grant based upon existing or already-planned provision of retail fixed terrestrial broadband services; and (3) have an opportunity to inform the Commission that such proposed broadband project would duplicate existing broadband service in the proposed project area. (f) Broadband build-Out data and reporting (1) In general The Commission shall establish broadband build-out, reporting, and accountability requirements. (2) Build-out data Any eligible partnership that receives a grant under this Act shall provide to the Commission complete, reliable, and precise information in a format specified by the Commission that indicates the location of new broadband service the eligible partnership is providing through the eligible broadband project. (3) Date The information described in subsection (f)(2) shall be provided to the Commission not later than 90 days after the earlier of— (A) the date of completion of any eligible broadband project milestones established by the Commission