Read the clues given below to classify an unknown organism.

Clue 1: A single-celled organism with no specialized organelles
Clue 2: Found in hot water springs and thermal vents

What is the correct classification of the organism?

Domain Bacteria; Kingdom Eubacteria
Domain Archaea; Kingdom Eubacteria
Domain Bacteria; Kingdom Archaebacteria
Domain Archaea; Kingdom Archaebacteria