Which two sentences describe how a team of engineers would be likely to use a physical model during the engineering design process?
A. They might develop a prototype that works differently than the
actual design so they do not confuse the results.
B. They might build and test a smaller model if the full-size design is
too expensive.
C. They might build a larger model in order to use up any extra
materials.
D. They might create a prototype of the real-life object to test and
refine their design.