Which of the following statements are correct with respect to mechanical design categories? 1. Failure of the part would endanger human life, or the part is made in extremely large quantities; consequently, an elaborate testing program is justified during design 2. The part is made in less quantities that a moderate series of tests is feasible 3. The part is made in such small quantities that testing is not justified at all; or the design must be completed so rapidly that there is not enough time for testing