单项选择题
Under which of the following circumstances would a technician use IPCONFIG /RENEW?（）
A. After an unsuccessful reboot
B. If a user’s IP address has been spoofed
C. After using IPCONFIG /RELEASE
D. If the computer has an ARP address conflict
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A user reports that their machine seems to be running slower than usual. The user states that the computer has become progressively worse as more applications are installed. Which of the following is the FIRST step the technician should take?（）
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