Arequirementissimplyastatementofwhatthesystemmustdoorwhatcharacteristicsitneedstohave.Requirementsevolvefrombroadstatementsofoverall(71)fromthesystemtodetailedstatementsofthebusinesscapabilitiesthatasystemshouldsupporttodetailedtechnicalstatementsofthewayinwhichthecapabilitieswillbeimplementedinthenewsystem.(72)focusondescribinghowtocreatethesoftwareproductthatwillbeproducedfromtheprojectNonfunctionalrequirementsareprimarilyusedinthedesignphasewhendecisionsaremadeabouttheuserinterface,thehardwareandsoftware,andthesystem'sunderlyingarchitecture.Thesystem'sphysicalandtechnicalenvironmentswouldbeconsidered(73).Thespeed,capacity,andreliabilityofthesystembelongto(74).(75)describesthatwhohasauthorizedaccesstothesystemunderwhatcircumstances. (74)应选？
A.security requirement
B.performance requirement
C.technical requirement
D.information requirement
正确答案是B