题目:Which of the following is not a feature of extreme programming (XP)?
A. computers of the XP team are set up in the centre of a large room
B. a client works with the XP team at all times ,no individual can work overtime for more than 2 successive weeks
C. it has a overall design phase an then a refacting procedure
D. there is no specialization, all members work on specification, design, code and testing
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