Q40. The molar conductivity for electrolytes $A$ and $B$ are plotted against $C ^ { 1 / 2 }$ as shown below. Electrolytes $A$ and\\
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$B$ respectively are :\\
(1) A: strong electrolyte ; B: weak electrolyte\\
(2) A: weak electrolyte ; B: weak electrolyte\\
(3) A: weak electrolyte ; B: strong electrolyte\\
(4) A: strong electrolyte ; B: strong electrolyte