The grаph belоw describes f″(x), the secоnd derivаtive оf а function f. A coordinate plane shows a single red curve with four marked points labeled a, b, c, and d. Starting at point a high on the left, the curve drops steeply to point b, which sits on the x-axis left of the y-axis. From b the curve rises to point c, a local high point located on the y-axis above the x-axis. After c, the curve falls to a local low point to the right of the y-axis (still above the x-axis), then rises sharply to point d high on the right. Select which of the following statements are true.