Problem 4 (15 points) For each of the following, determine whether the described problem is a forward problem or an inverse problem. Explain your reasoning. (a) (5 points) Reconstructing a computerized tomography (CT) image from its sinogram (b) (5 points) Acquiring the complex-valued phase history data for radar imaging (c) (5 points) Restoring an image to eliminate the motion blur caused by camera movement