Which gaming company first successfully launched a mainstream consumer VR headset that sold over 1 million units?

Test your knowledge of the landmark moments in virtual reality gaming history! The gaming industry has seen revolutionary advancements in how we experience virtual worlds, with various companies pioneering different technologies and experiences. This question focuses on a significant moment in VR gaming's commercial journey that helped shape today's immersive experiences.

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Oculus (with the Oculus Rift)
Sony (with PlayStation VR)
HTC (with the Vive)
Nintendo (with Virtual Boy)