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Ninjas were covert agents or mercenaries in feudal Japan, active during the 14th century and beyond. They specialized in espionage, sabotage, infiltration, and asymmetric warfare using stealth tactics. The term 'ninja' derives from the Japanese characters meaning 'to stealth' or 'to hide',' which accurately describes their operational methodology. The other options (Ganjas, Ranges, Ranjas) are not historically documented terms related to Japanese secret organizations.