1. $$\frac{{{\text{pd}}}}{{\text{t}}}$$
  2. $$\frac{{{\text{pd}}}}{{2{\text{t}}}}$$
  3. $$\frac{{{\text{pd}}}}{{4{\text{t}}}}$$
  4. $$\frac{{{\text{pd}}}}{{6{\text{t}}}}$$
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Answer: Option 3

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