单项选择题
Which of the following will help protect an operating system from vulnerability？（）
A.Download free anti-virus programs from the Internet.
B.Perform updates from the manufacturers website regularly.
C.Using the operating systems email program only to open attachments.
D.Monitoring what is displayed on the screen.
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C.RAID 0
D.RAID 2 -
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Whichofthefollowingshouldbeconsideredwhenupgradingmemory？（）
A.speed of memory
B.memory slot color
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Auserreportsthatwhentryingtoprintadocumentnothingcomesoutoftheprinterandstatesthattheonlyprinterintheprinterdialogboxis’MicrosoftOfficeDocumentImageWriter.’Thetechnicianshouldunderstandthattheproblemisthattheprinter：（）
A.has not been installed on the user’s computer.
B.is not turned on.
C.driver is corrupt.
D.cable is unplugged.
