A semiconductor product consists of three layers. Suppose that the variances in thickness of the first, second, and third layers are 25, 40, and 30 square nanometers, respectively, and the layer thicknesses are independent. What is the variance of the thickness of the final product? Select the correct response: 95 square nanometers 9.75 micrometers 95 square millimeters 9.75 nanometers

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