2. (20 points) Compare and contrast the following. Describe the differences and advantages and disadvantages.
a. Investment casting of aluminum vs. machining from solid bar to make an automotive connecting rod, quantity of 24.
b. Thermoplastic CFRP vs. thermoset CFRP for manufacturing aircraft composite stiffeners, quantity of four.
c. Extrusion vs. machining from solid bar channel shape (see picture), titanium alloy, 18 inches long 1.5 inches high, 2.25 inches wide, approximately 0.2 inches thick, quantity of three.
d. Permanent mold casting vs. die casting for a zinc door stop, three-dimensional shape, quantity of 100,000 (not including rubber tip or the screw-threaded end).