Q. If are does not want anyone else to read or write to a file named datfile,except through a program in a file filex,then he may use (Solved)
1. chmod u+s filex; chmod go -rw datfile
2. chmod 4711 filex; chmod go -rw datfile
3. chmod 4711 datfile; chmod go - rw filex
4. both a & b
- d. both a & b