How do you interpret the mode of file$1?$ a$.$ User$1$ has read and write, members of the root group have read and execute, and all others have read permissions to the file. b$.$ Members of the root group have read and write, user$1$ has read and execute, and all others have read permissions to the file. c$.$ All users have read and write, members of the root group have read and execute, and user$1$ has read permissions to the file. d$.$ User$1$ has read and write, all others have read and execute, and members of the root group have read permissions to the file.