Which command sets an ACL that gives user alice read permission on a file currently with 644 permissions?

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Multiple Choice

Which command sets an ACL that gives user alice read permission on a file currently with 644 permissions?

Explanation:
ACLs extend the standard permission bits by letting you grant access to specific users without changing owner/group/other permissions. To give user alice exactly read permission on a file that currently has 644, add a per-user ACL entry with read-only access: setfacl -m u:alice:r-- filename. This creates or updates alice’s ACL so she can read the file, without granting write permission. Reading the ACL (getfacl) or changing ownership (chown) won’t modify access rights, and granting rw- (setfacl -m u:alice:rw- filename) would give alice write access as well, which isn’t what’s requested.

ACLs extend the standard permission bits by letting you grant access to specific users without changing owner/group/other permissions. To give user alice exactly read permission on a file that currently has 644, add a per-user ACL entry with read-only access: setfacl -m u:alice:r-- filename. This creates or updates alice’s ACL so she can read the file, without granting write permission. Reading the ACL (getfacl) or changing ownership (chown) won’t modify access rights, and granting rw- (setfacl -m u:alice:rw- filename) would give alice write access as well, which isn’t what’s requested.

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