What is the $3-2-1$ rule of backups?

Store $3$ coples of data store cuples on $2$ locations, store $1$ copy on tape

Store $3$ coples on a separate location, store on $2$ types of media, store $1$ copy of data on tape

store $3$ coples of data, store $2$ copies on tape, store $1$ copy on a separate location

Store $3$ coples of data, store on $2$ types of medla, store $1$ copy an a separate location