The three-dimensional measuring system used may be dependent on ________ maker recommendations. With the addition of new high-strength steels to many vehicle designs, such as boron-alloyed _________ , the use of heat is being allowed less often as heat destroys the strength. Another type of straightening process is called paintless dent repair (PDR) and is used for small, mild dents. PDR uses special _________ and equipment to remove dents without damaging the finish.
a) Vehicle; Aluminum; Tools
b) Manufacturer; Steel; Techniques
c) Repair; Titanium; Materials
d) Collision; Carbon fiber; Instruments