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Which one of the following is the definition of ultimate tensile strength $\text{(UTS)}$ obtained from a stress-strain test on a metal specimen?

  1. Stress value where the stress-strain curve transitions from elastic to plastic behavior
  2. The maximum load attained divided by the original cross-sectional area
  3. The maximum load attained divided by the corresponding instantaneous cross-sectional area
  4. Stress where the specimen fractures
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