Which VR headset was the first to introduce 'inside-out tracking' that eliminated the need for external sensors or base stations?

Virtual reality has transformed gaming experiences over the past decade. The evolution of VR headsets represents one of the most significant technological advances in gaming history, changing how players interact with virtual worlds. This trivia question explores a key milestone in VR hardware development that helped bring immersive gaming to mainstream audiences.

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Oculus Rift CV1
Oculus Quest
HTC Vive
PlayStation VR