ExtremeProgramming(XP)isadisciplineofsoftwaredevelopmentwith__1__ofsimplicity,communication,feedbackandcourage.Successfulsoftwaredevelopmentisateameffort-notjustthedevelopmentteam,butthelargerteamconsistingofcustomer,managementanddevelopers.XPisasimpleprocessthatbringsthesepeopletogetherandhelpsthemtosucceedtogether.XPisaimedprimarilyatobject-orientedprojectsusingteamsofadozenorfewerprogrammersinonelocation.TheprinciplesofXPapplytoany___2___projectthatneedstodeliverqualitysoftwarerapidlyandflexibly.AnXPprojectneedsa(an)__3___customertoprovideguidance.Customers,programmers,managers,areallworking___4__tobuildthesystemthat'sneede D．Customers-thosewhohavesoftwarethatneedstobedeveloped-willlearnsimple,effectivewaysto__5___whattheyneed,tobesurethattheyaregettingwhattheyneed,andtosteertheprojecttosuccess. 4、_____
A.together
B.by themselves
C.separately
D.alone
正确答案是A