end of the determination period, the governor of the State in which the tract is located— (i) nominates the tract for designation as a qualified gigabit opportunity zone, and (ii) notifies the Secretary in writing of such nomination, and (B) the Secretary certifies such nomination and designates such tract as a qualified gigabit opportunity zone before the end of the consideration period. (2) Extension of periods A governor may request that the Secretary extend either the determination or consideration period, or both (determined without regard to this subparagraph), for an additional 30 days. (c) Other definitions For purposes of this subsection— (1) Low-income communities The term low-income community has the same meaning as when used in section 45D(e). (2) Definition of periods (A) Consideration period The term consideration period means the 30-day period beginning on the date on which the Secretary receives notice under subsection (b)(1)(A)(ii), as extended under subsection (b)(2). (B) Determination period The term determination period means the 90-day period beginning on the date on which the State adopts the Uniform Model Broadband Act described in subsection (a)(1)(A), as extended under subsection (b)(2). (d) Guidance for opportunity zone nominations When considering the nomination of qualified gigabit opportunity zones, governors should strive for the creation of qualified gigabit opportunity zones that are geographically concentrated and contiguous clusters of population census tracts and should give particular consideration to areas that— (1) are currently facing obstacles to economic development due to a lack of geographic broadband coverage or a lack of broadband speed, (2) are currently the focus of mutually reinforcing State, local, or private economic development initiatives, and (3) (A) are poised for economic growth that requires access to high speed broadband for commercial purposes, and (B) represent the areas of a State where such service would result in the highest return on investment. (e)