1. $$\left( {{\text{p}} - 2{\text{d}}} \right){\text{t}}{\sigma _{\text{c}}}$$
  2. $$\left( {{\text{p}} - {\text{d}}} \right){\text{t}}\tau $$
  3. $$\left( {{\text{p}} - {\text{d}}} \right){\text{t}}{\sigma _{\text{t}}}$$
  4. $$\left( {2{\text{p}} - {\text{d}}} \right){\text{t}}{\sigma _{\text{t}}}$$
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Answer: Option 3

Let'

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