单项选择题
Whichimplementphaseservicecomponentconsistsofpreparingformigration，excutinganetworkmigrationplan，andcompletingmigrationtestcases？（）
- A.stagingandsystemmigration
B.postimplementationsupporthandoffmeeting
C.detaileddesigndevelopment
D.stafftraining
E.migrationplandevelopment
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