Which gaming company's VR headset first broke the 1 million units sold milestone, helping to establish VR gaming as a viable consumer product category?

The gaming industry has undergone massive transformation over the decades, with virtual reality representing one of the most significant leaps forward in immersive gameplay. As product innovation continues to reshape how we experience virtual worlds, test your knowledge about a pivotal moment in VR gaming history that changed the landscape of consumer VR adoption.

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Oculus (with the Oculus Rift)
Sony (with the PlayStation VR)
HTC (with the HTC Vive)
Valve (with the Valve Index)