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