单项选择题
The system administrator has requested that all setuid/setgid bits be removed from executables in application filesystem. Which command will achieve this?（）
A. chmod -R o-s /application
B. chmod -R ug-s /application
C. chmod -R -s -o /application
D. chmod -R -s -ug /application
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A. topas -D
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An operator is editing a file using vi. Which of the following subcommand sequences will copy the current line plus the next 2 lines to the end of the file?（）
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