选择题：Extreme Programming（XP）is a discipline of software development with___1__of simplicity,communication,feedback and courage.Successful software development is a teameffort-not just the development team,but the larger team consisting of customer,management a

Extreme Programming（XP）is a discipline of software development with___1__of simplicity,communication,feedback and courage.Successful software development is a teameffort-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 andhelps them to succeed together.XP is aimed primarily at object-oriented projects using teamsof a dozen or fewer programmers in one location.The principles of XP apply to any__2___project that needs to deliver quality software rapidly and flexibly.An XP project needs a（an）__3___customer to provide guidance.Customers,programmers,managers,are all working___4__to build the system that'sneedeD．Customers-those who have software that needs to be developed-will learn simple,effective ways to___5__what they need,to be sure that they are getting what they need,and to steer the project to success.
3、_____
A.part-time
B.casual
C.seldom
D.full-time