单选题Which of the following is a sign that a computer has been infected by a worm?（）AScreensaver changed on its ownBUnauthorized outgoing emails being sentCDesktop background changed on its ownDLeft and right mouse buttons have been flipped
单选题
Which of the following is a sign that a computer has been infected by a worm?（）
A
Screensaver changed on its own
B
Unauthorized outgoing emails being sent
C
Desktop background changed on its own
D
Left and right mouse buttons have been flipped
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