Duringthesystemsplanningphase.asystemsanalystconductsa(请作答此空)activitytostudythesystemsrequestandrecommendspecificaction.Afterobtaininganauthonzationtoproceed.theanalystinteractswith()togatherfactsabouttheproblemofopportunity,projectscopeandconstraints,projectbenefits,andestimateddevelopmenttimeandcosts.Inmanycases.thesystemsrequestdoesnotrevealtheunderyingproblem,butonlyasymptom.Apopulartechniqueforinvestigatingcausesandeffectsiscalled()Theanalysthasanalyzedtheproblemoropportunity.definedtheprojectscopeandconstraints,andperformed()toevaluateprojectusability,costs,benefits,andtimeconstraints.Theendproductoftheactivityis().Themaincontentmustincludeanestimateoftime.staffingrequrements,costs,benefits,andexpectedresultsforthenextphaseoftheSDLC
A.case study
B.requirements discovery
C.preliminary investigation
D.business understanding
正确答案是C