Which of the following functions corresponds to the piecewise-defined function below? f(x) = 2x + 4, x > -4/2 -(2x + 4), x < -4/2 a) f(x) = |2x + 4| b)f(x) = |2x - 4| c)f(x) = |-2x + 4| d)f(x) = |2x + 8|