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C
