The root user utilizes the chgrp command to give ownership of a file to another user. What must the root user do to regain ownership of the file?
a. Run chgrp again listing the root user as the new owner.
b. Nothing, because this is a one-way, one-time action.
c. Have the new owner run chgrp and list the root user as the new owner.
d. Run chown and list the root user as the new owner.
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