The correct answer is: A. the system must make provision for new techniques.
A common database is one requisite for converting CAD and CAM to CIM. Another is that the system must make provision for new techniques. This is because CIM is a dynamic system that needs to be able to adapt to new technologies as they emerge. If the system is not able to do this, it will become outdated and will no longer be able to meet the needs of the manufacturing industry.
Option B is incorrect because a common 3-D part description system is not necessary for CIM. CIM can be implemented using a variety of different 3-D part description systems.
Option C is incorrect because the user does not need to have access to both hardware and software for CIM. The user can access the system through a variety of different devices, such as a computer, a tablet, or a smartphone.
Option D is incorrect because technical assistance does not need to be provided to the user for CIM. The system can be designed to be user-friendly and easy to use.
Option E is incorrect because all of the options are necessary for converting CAD and CAM to CIM.