Arequirementissimplyastatementofwhatthesystemmustdoorwhatcharacteristicsitneedstohave.Requirementsevolvefrombroadstatementsofoverall(71)fromthesystemtodetailedstatementsofthebusinesscapabilitiesthatasystemshouldsupporttodetailedtechnicalstatementsofthewayinwhichthecapabilitieswillbeimplementedinthenewsystem.(72)focusondescribinghowtocreatethesoftwareproductthatwillbeproducedfromtheprojectNonfunctionalrequirementsareprimarilyusedinthedesignphasewhendecisionsaremadeabouttheuserinterface,thehardwareandsoftware,andthesystem'sunderlyingarchitecture.Thesystem'sphysicalandtechnicalenvironmentswouldbeconsidered(73).Thespeed,capacity,andreliabilityofthesystembelongto(74).(75)describesthatwhohasauthorizedaccesstothesystemunderwhatcircumstances. (75)应选？
A.System constraint
B.Cultural requirement
C.Control requirement
D.Security requirement
正确答案是D