Correct Answer - Option 3 : Both (a) and (b)
The correct answer is option 3.
UNIX provides three types of permissions using octal numbers
1. Read(R or 4)
2. Write (W or 2)
3. Execute (X or 1)
UNIX provide three sets of permissions. For each set of permission, we are having 3 types of permissions.
permission for the owner(RWX or 421)
permission for a group(RWX or 421)
permission for others(RWX or 421)
- We can change/modify permissions using chmod, chown, etc...commands.
- We can see the permissions for file using -l command
Hence the correct answer is Both (a) and (b).