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271 . Which of the following commands is used to display the filenames in multiple columns?
A. ls
B. ls -1
C. ls -x
D. lc

272 . Which command is used with file named 'note' to remove the executable permission from the user and assign read permission to the group and others?
A. chmod u-x, go+r note
B. chmod go+r, u+x note
C. chmod g-x, uo+r note
D. chmod go+x, u-x note