The correct answer is: B. using one computer to control several machines.
Direct numerical control (DNC) is a computer-controlled manufacturing process in which a computer is used to control one or more machines. The computer receives instructions from a program, which is typically written in a language such as G-code, and then sends these instructions to the machines. The machines then perform the instructions, which can be to cut, drill, or otherwise shape materials.
DNC is a more efficient and accurate way to control machines than traditional methods, such as manual control or hard-wired control. It can also be used to automate repetitive tasks, which can free up human operators to perform other tasks.
A. Using several computers to control one large machine is not DNC. In DNC, there is one computer that controls several machines.
C. Complete elimination of a need for a human operator is not DNC. In DNC, there is still a need for human operators to monitor the machines and to intervene if necessary.
D. Eliminating computers from the manufacturing process is not DNC. DNC is a computer-controlled manufacturing process.
E. None of the above is the correct answer.