The Difference Between a Machine and a Structure Is

Multiple Choice

The difference between a machine and a structure is

A) The machine serves to modify and transmit forces only whereas structures serve to modify and transmit mechanical work
B) The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
C) The relative motion exists between the parts of a structures whereas it does not exist in machines
D) Structures are temporary constructions whereas machines are paramanent
E) None of the above