When applied to a directory, the SGID
special permission _________.
a. causes all new files created in the
directory to have the same group
membership as the directory, and not
the entity that created them
b. cannot be used, because it is applied
only to files
c. allows users the ability to use more
than two groups for files that they
create within the directory
d. causes users to have their
permissions checked before they are
allowed to access files in the directory