单项选择题
YouhaveacomputerthatrunsWindowsXP.Thecomputerhasonebasicdiskthatcontainsasingle partition.Thepartitionhas30GBoffreespace.Theharddiskhas5GBofunallocatedspace.YouneedtoinstallWindows7inadual-bootconfiguration.Windows7mustnotbeinstalledinavirtualharddisk（VHD）.Whatshouldyoudofirst？（）
A.Createasecondpartition.
B.Shrinktheprimarypartition.
C.ConverttheharddisktoaGPTdisk.
D.Converttheharddisktoadynamicdisk.
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