9. Consider the following integral 2-x2- y2 (22 + V1-x2 + y?) dz dy dx. -V1-x2 JVx2 + y? Which of the following statements are correct? I) The boundary of the projection region of the solid given by the integral is a circle with ra- dius 2 in the xy-plane. II) This integral represents the volume of the Va2 + y2. cone z III) This integral is transformed by the cylindrical coordinates to the integral 2T /2-r2 * dz dr de (a) I, II (b) I, III (c) II , III (d) Only II (e) Only III