Before Segway manufactured its two-wheeled people movers, it built a prototype and had staff engineers test it for performance and

Before Segway manufactured its two-wheeled people movers, it built a prototype and had staff engineers test it for performance and stability. At this stage, Segway was involved in
A) alpha testing.
B) product launch.
C) test marketing.
D) beta testing.
E) concept testing.

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