; (II) reviewing any other source that is relevant to service data validation, as determined by the Secretary; and (III) performing site-specific testing to verify the unavailability of any residential broadband service in the unserved rural community. (ii) Adjustments Not less often than once every 2 years, the Secretary shall review, and may adjust through notice published in the Federal Register, the unserved communities identified under clause (i). ; and (D) by adding at the end the following: (3) Grant amounts (A) Definition of development costs In this paragraph, the term development costs means costs of— (i) construction, including labor and materials; (ii) project applications; and (iii) other development activities, as determined by the Secretary. (B) Eligibility To be eligible for a grant under this section, the project that is the subject of the grant shall be carried out in a rural area. (C) Maximum Except as provided in subparagraph (D), the amount of any grant made under this section shall not exceed 50 percent of the development costs of the project for which the grant is provided. (D) Secretarial authority to adjust The Secretary may make grants of up to 75 percent of the development costs of the project for which the grant is provided to an eligible entity if the Secretary determines that the project serves— (i) an area of rural households described in paragraph (2)(A)(ii); and (ii) a rural community described in any of subclauses (I) through (IV) of paragraph (2)(B)(i). ; (3) in subsection (d)— (A) in paragraph (1)— (i) in subparagraph (A)— (I) in the matter preceding clause (i), by striking loan or and inserting grant, loan, or ; (II) in clause (ii), by striking a loan application and inserting an application ; and (III) in clause (iii)— (aa) by striking service and inserting infrastructure ; (bb) by striking loan the first place it appears; (cc) by striking 3 and inserting 5