Arequirementissimplyastatementofwhatthesystemmustdoorwhatcharacteristicsitneedstohave.Requirementsevolvefrombroadstatementsofoverall(71)fromthesystemtodetailedstatementsofthebusinesscapabilitiesthatasystemshouldsupporttodetailedtechnicalstatementsofthewayinwhichthecapabilitieswillbeimplementedinthenewsystem.(72)focusondescribinghowtocreatethesoftwareproductthatwillbeproducedfromtheprojectNonfunctionalrequirementsareprimarilyusedinthedesignphasewhendecisionsaremadeabouttheuserinterface,thehardwareandsoftware,andthesystem'sunderlyingarchitecture.Thesystem'sphysicalandtechnicalenvironmentswouldbeconsidered(73).Thespeed,capacity,andreliabilityofthesystembelongto(74).(75)describesthatwhohasauthorizedaccesstothesystemunderwhatcircumstances. (72)处应选？
A.User requirements B.Business requirements C.Function requirements D.System requirements正确答案C
