Which of the following pairs of solutions are isotonic?

Question

0.001 M $CaCl_2$ and 0.001 M $Al_2(SO_4)_3$

0.01 M $BaCl_2$ and 0.001 M $CaCl_2$

0.01 M $BaCl_2$ and 0.015 M $NaCl$

0.001 M $Al_2(SO_4)_3$ and 0.01 M $BaCl_2$

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