machine tools enable the machinist's skills to be duplicated by a programmable device that controls the movements of a tool used to make complex shapes.

d. Numerical control (NC)

Explanation:

The options are:

a. Movement control (MC)

b. Virtual control (VC)

c. Revision control (RC)

d. Numerical control (NC)

Please note that we are in search of a set of machine tools that enables the machinist's skills to be replaced by the programmable devices, and that controls the movement of the tool which is used to make the complex shapes. And this is not possible with the help of the movement control machine tools, virtual control machine tools or revision control machine tools as they are not programmable. And the only programmable machine tools are the Numerical control machine tools. And hence, D. is the correct option here.

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