1. $$\frac{l}{3}$$ from B
  2. $$\frac{l}{3}$$ from A
  3. $$\sqrt {\frac{{{l^2} - {{\text{a}}^2}}}{3}} $$  from B
  4. $$\sqrt {\frac{{{l^2} - {{\text{b}}^2}}}{3}} $$  from A
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Answer: Option 3

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