Answer is Archaea, Bacteria, and Eukarya.
According to the modern taxonomy, the highest taxonomic rank of organisms is a domain. There are three domains in the tree of life: Archaea, Bacteria, and Eukarya. Archae and Bacteria are Prokaryotes, unicellular organisms without a nucleus and organelles. Eukarya mostly includes multicellular organisms with a nucleus and organelles. The basis of this classification is differences of ribosomal RNA.
