If one doesn't want anyone else to read or write to a file named datf – McqOptions

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1.	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» E.

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