Which option is used in the Samba configuration file to set which files and directories are neither visible to or accessible by the clients?

mangle names controls 8.3 filename mangling for legacy DOS clients and has nothing to do with hiding or restricting access to files.

hide dot files hides files whose names begin with a dot, mimicking Unix convention, but does not make them inaccessible.

hide special files hides special filesystem objects such as sockets and devices from directory listings but does not restrict accessibility for normal files.

hide files conceals matched files from directory listings but clients that know the filename can still access them, so it does not block accessibility.

The veto files parameter in smb.conf specifies a list of files and directories that Samba will neither list in directory listings nor allow clients to open or access. This is a two-way restriction covering both visibility and accessibility, distinguishing it from hide files, which conceals entries from listings but still permits access if the client knows the name.