Which of the following is a common software used for CAD?

AutoCAD is widely recognized as a common software used for computer-aided design (CAD). Its primary function is to assist engineers, architects, and drafters in creating 2D and 3D technical drawings with precision and efficiency. The features of AutoCAD, such as layers, scaling, and various drawing tools, make it particularly suitable for detailed design work in a variety of fields including architecture, engineering, and product design.

In contrast, while SketchUp is also a CAD software, it is generally more specific to architectural and conceptual modeling rather than technical drawing at a detailed level. Photoshop and Illustrator, on the other hand, are graphic design tools rather than CAD programs. Photoshop is specialized for image editing and raster graphics, while Illustrator focuses on vector graphics; neither is typically used for technical or engineering design in the same way that AutoCAD is. This distinction is important as it emphasizes the specific applications and features of software relevant to CAD.