; (B) reserve not more than 1 percent of the allotment for the administrative costs of carrying out its responsibilities under this section, including public reporting on how funds made available under this section are being expended by eligible entities; and (C) use the amount made available to the State and not reserved under subparagraphs (A) and (B) for activities designed to support eligible entities in identifying, planning, and implementing school security improvements. (4) Subgrants to eligible entities (A) In general Each State that receives an allotment under paragraph (2) shall award subgrants to eligible entities to support the eligible entities in identifying, planning, and implementing school security improvements. (B) Applications An eligible entity that desires to receive a subgrant grant under this paragraph shall submit an application to the State at such time, in such manner, and accompanied by such information as the State may require. (C) Use of subgrant funds An eligible entity that receives a subgrant under this paragraph shall use the subgrant funds, subject to any rules established by the State, for the purpose of planning and designing school buildings and facilities, installing infrastructure, and implementing technology or other measures, that strengthen security on school premises, which may include— (i) controlling access to school premises or facilities, through the use of metal detectors, or other measures, or technology, with evidence-based effectiveness (to the extent the State involved determines that such evidence is reasonably available), in accordance with the needs of the school; (ii) implementing any technology or measure, or installing any infrastructure, to cover and conceal students within the school during crisis situations; (iii) implementing technology to provide notification to relevant law enforcement and first responders during crisis situations