The correct answer is D. All of the above.
A general CAD system is a computer-aided design system that can be used to create a variety of 2D and 3D models. It should provide a system for handling user actions, a system for the operation of applications programming, and a set of basic system functions and utilities.
A system for handling user actions is necessary to allow users to interact with the CAD system and create their models. This system should provide a way for users to input data, select commands, and view their models.
A system for the operation of applications programming is necessary to allow users to create their own applications for the CAD system. This system should provide a way for users to create and modify programs, and to run those programs on the CAD system.
A set of basic system functions and utilities is necessary to provide basic functionality for the CAD system. This set of functions should include things like file management, printing, and plotting.
Here is a brief explanation of each option:
- Option A: A system for handling user actions. This is necessary to allow users to interact with the CAD system and create their models. This system should provide a way for users to input data, select commands, and view their models.
- Option B: A system for the operation of applications programming. This is necessary to allow users to create their own applications for the CAD system. This system should provide a way for users to create and modify programs, and to run those programs on the CAD system.
- Option C: A set of basic system functions and utilities. This is necessary to provide basic functionality for the CAD system. This set of functions should include things like file management, printing, and plotting.
- Option D: All of the above. This is the correct answer, as a general CAD system should provide all of the above.
- Option E: None of the above. This is the incorrect answer, as a general CAD system should provide all of the above.