The stereotypical e-reader uses a low-power screen technology called e-paper.

Answer is grayscale

The electronic paper also sometimes called an electrophoretic display (EPD) is bistable. This means that content displayed on an EPD is like a sketch in your notebook which usually remains there until it is erased and it will hold a static image even without electricity.Bistable particles will be provided in several levels of grayscale (the energy required to immerse the color particles in their place) in more advanced e-paper.

Ithink the answer is b. hope this .

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