1. $$\frac{{{\text{pd}}}}{{{\sigma _{\text{t}}}}}$$
  2. $$\frac{{{\text{pd}}}}{{2{\sigma _{\text{t}}}}}$$
  3. $$\frac{{{\text{pd}}}}{{3{\sigma _{\text{t}}}}}$$
  4. $$\frac{{{\text{pd}}}}{{4{\sigma _{\text{t}}}}}$$
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Answer: Option 4

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