单项选择题
A user’s laptop does not produce sound even though the volume settings are at maximum in theoperating system. Which of the following would MOST likely resolve this issue?（）
A. A new sound card
B. A new speaker
C. A BIOS update
D. A hardware volume control
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After installing a new optical drive into a workstation, which of the following will ask for anacknowledgement?（）
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