单项选择题

Which of the following utilities, in Windows, can be configured to perform automatic disk defragmentation?（）

A. Task Scheduler
B. Disk Defragmenter Tool
C. Task Manager
D. Disk Manager

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A technician is troubleshooting a WLAN card in a laptop. The wireless infrastructure is 802.11g.
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A. The WLAN card is 802.11g.
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