विस्तृत व्याख्या:

Unique Extracellular Structures in Archaea (आर्किया की विशिष्ट संरचनाएं):

• Cannulae: Hollow, hollow-tube glycoproteins that interconnect individual cells of marine hyperthermophilic archaea belonging to the genus Pyrodictium, forming complex multicellular networks capable of withstanding extreme boiling hydrothermal conditions.
• Hami: Unique, nano-scale filaments resembling barbed grappling hooks with a three-pronged anchor at their tip, found on the cell surfaces of uncultivated SM1 euryarchaeal biofilms (Altiarchaeum hamiconexum) inhabiting cold sulfur springs, used to anchor cells to mineral substrates and each other.
• Neither cannulae nor hami are found in Eubacteria, Mycoplasma, or Eukaryotes (Yeast).

Correct Answer: Option 2 (Archaea).