Which of the following statements is/are incorrect ? (a) Mapping the co-ordinates of the points and lines that form the picture into the appropriate co-ordinates on the device or workstation is known as viewing transformation. (b) The right handed cartesian co-ordinates system in whose coordinates we describe the picture is known as world coordinate system. (c) The co-ordinate system that corresponds to the device or workstation where the image is to be displayed is known as physical device co-ordinate system. (d) Left-handed co-ordinate system in which the display area of the virtual display device corresponds to the unit(|x|) square whose lower left handed corner is at origin of the co-ordinate system, is known as normalized device coordinate system. (A) (a) only (B) (a) and (b) (C) (c) only (D) (d) only