Evaluate the definite integral and interpret the result.
A. 4; the shaded area above the x-axis minus the shaded area below the x-axis equals 4.
B. 0; the shaded area above the x-axis is equal to the shaded area below the x-axis.
C. 16; the shaded area above the x-axis minus the shaded area below the x-axis equals 16.
D. 16; the shaded area above the x-axis plus the shaded area below the x-axis equals 16.
Answer: B
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