The correct answer is: A. a common data base and communications system.
CAE (Computer-Aided Engineering) and CAM (Computer-Aided Manufacturing) are two closely related fields that use computer technology to design and manufacture products. CAE is used to design and analyze products, while CAM is used to control the manufacturing process.
A common data base and communications system is essential for linking CAE and CAM. This allows the two systems to share information, such as product designs and manufacturing data. This information can then be used to improve the design and manufacturing process.
Option B, NC tape programming and automated design, is incorrect. NC tape programming is a method of controlling machine tools that was used before the development of CAM. Automated design is a process that uses computer technology to create product designs. However, these two processes are not directly linked to each other.
Option C, parts production and testing, is incorrect. Parts production and testing are two separate processes that are not directly linked to each other. Parts production is the process of creating physical products, while testing is the process of verifying that products meet specifications.
Option D, assembly automation and tool production, is incorrect. Assembly automation is the process of automating the assembly of products, while tool production is the process of creating tools that are used in manufacturing. These two processes are not directly linked to each other.
Option E, None of the above, is also incorrect. A common data base and communications system is the most important link between CAE and CAM.