The air doors are moved by which of the following methods? Select one:
a. Cable
b. Vacuum actuator
c. Electric actuator
d. All of the above

A)-in the process of engineering design, explain the contribution of material selection. b)- explain the procedure of synthesis as is employed in engineering design. c)- is there any relationship between ergonomics and engineering design? explain. d)- safety consideration in engineering design includes human, product and the enviroment . explain how safety will be incorporated into the design?