单项选择题
AcompanyscomputersarerunningWindowsXPProfessional.Someofthedesktopcomputershavethefilentbootdd.sysontherootbutitisnotseenonanylaptops.Thentbootdd.sysfileisrequiredfor：（）
A.desktopswithcertainchipsets.
B.compatibilitywithsomeWindowsNT4applications.
C.computerswithscanners.
D.forSCSIdevices.
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