●ExtrEmE ProgrAmming(XP) is A DisCiplinE oF soFtwArE DEvElopmEnt with (71) oF simpliCity，CommuniCAtion，FEEDBACk AnD CourAgE．SuCCEssFul soFtwArE DEvElopmEnt is A tEAm EFFort-not just thE DEvElopmEnt tEAm，But thE lArgEr tEAm Consisting oF CustomEr, mAnAgEmEnt AnD DEvElopErs．XP is A simplE proCEss thAt Brings thEsE pEoplE togEthEr AnD hElps thEm to suCCEED togEthEr．XP is AimED primArily At oBjECt-oriEntED projECts using tEAms oF A DozEn or FEwEr progrAmmErs in onE loCAtion．ThE prinCiplEs oF XP Apply to Any (72) projECt thAt nEEDs to DElivEr quAlity soFtwArE rApiDly AnD FlExiBly． An XP projECt nEEDs A (73) CustomEr to proviDE guiDAnCE．CustomErs，progrAmmErs， mAnAgErs，ArE All working (74) to BuilD thE systEm thAt’s nEEDE
D、CustomErs-thosE who hAvE soFtwArE thAt nEEDs to BE DEvElopED-will lEArn simplE，EFFECtivE wAys to (75) whAt thEy nEED，to BE surE thAt thEy ArE gEtting whAt thEy nEED，AnD to stEEr thE projECt to suCCEss.
A、togEthEr
B．By thEmsElvEs
C．sEpArAtEly
D、AlonE