Which of the following statement is correct as regard to the difference between a machine and a structure?

A The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another.
B The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only.
C A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work.
D all of the mentioned

Correct Answer: all of the mentioned

None

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