Q.

If one doesn't want anyone else to read or write to a file named datfile, except through a program in a file filex , then he may use

A. chmod u+s filex ; chmod go_rw datfile
B. chmod 4711 filex ; chmod go_rw datfile
C. chmod 4711 datfile ; chmod go_rw filex
D. both (a) and (b)
Answer» D. both (a) and (b)
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