A file named employees.odt has a mode of rwrr. If mhuffman is not the file's owner but is a member of the group that owns this file, what can he do with it? a. He can open the file, make changes, and save the file. b. He can change ownership of the file. c. He can run the file if it's an executable. d. He can open the file and view its contents, but he can't save any changes