According to the Quick Access Prefire Plan (QAPP) for a building located at 6100 Great Falls Lane, this is 45-feet by 100-feet, one-story, ordinary construction retail building with roof construction of wooden 2-inch by 10-inch rafters, plywood, and composition roof covering. Floor construction is concrete slab. As a Company Officer (CO), you must be able to accurately predict the required fire flow at various levels of fire involvement. If the level of involvement is at 25%, what is the estimated fire flow (in gallons per minute (gpm)) required for this building? 375 gpm. 1,500 gpm. 500 gpm.