单选题Which of the following will help protect an operating system from vulnerability？（）ADownload free anti-virus programs from the Internet.BPerform updates from the manufacturers website regularly.CUsing the operating systems email program only to open attachments.DMonitoring what is displayed on the screen.
单选题
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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