Select the correct answer. Consider the function . A waveform passes through (minus pi, minus 0.5), (minus pi by 2, minus 1.5), (0, minus 0.5), (pi by 2, minus 1.5), and (pi, minus 0.5) Which statement is true about the function? A. The amplitude of the function is 1. B. The domain of the function is . C. The period of the function is . D. The midline of the function is .