The correct answer is: A. Numerical control.
CAM (computer-aided manufacturing) is the use of computers to control machine tools and related machinery in the manufacturing of products. CAM is a type of computer-aided engineering (CAE) that uses computer software to control the manufacturing process.
Numerical control (NC) is the automation of machine tools that are operated by numerical control (NC) instructions. An NC machine tool is a machine tool that is controlled by a computer program. The program is called a part program, and it contains the instructions that tell the machine tool how to move and what to do.
Drafting is the process of creating technical drawings. A technical drawing is a drawing that shows the dimensions and other features of an object. Drafting is used in many industries, including engineering, architecture, and manufacturing.
Documentation is the process of creating and maintaining records. Documentation can be in the form of text, images, or other media. Documentation is used in many industries, including business, government, and education.
Geometric modeling is the process of creating a mathematical representation of an object. A geometric model is a representation of an object that is based on its geometry. Geometric modeling is used in many industries, including engineering, architecture, and manufacturing.
None of the above is a CAM technology.