A.Inpiduallybeforeeachnodeisupgraded
B.Inpiduallybeforeandaftereachnodeisupgraded
C.Inpiduallyaftereachnodehasbeenupgraded
D.Collectivelyafterallnodeshavebeenupgraded
参考答案：D
AInpiduallybeforeeachnodeisupgradedBInpiduallybeforeandaft
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