Manyoftheactivitiesperformedduringthepreliminaryinvestigationarestillbeingconductedin(),butinmuchgreaterdepththanbefore.Duringthisphase,theanalystmustbecomefullyawareofthe()andmustdevelopenoughknowledgeaboutthe()andtheexistingsystemstoenableaneffectivesolutiontobeproposedandimplemented.Besidesthe()forprocessanddataofcurrentsystem,thedeliverablefromthisphasealsoincludesthe(5)fortheproposedsystem. (5)应选()
A.hardware and software specification
B.system performance specification
C.formal requirements definition
D.general problem statement
正确答案是C