Which one of the following pairs of isomers is an example of metamerism?

In the above reactions, product A and product B respectively are :

The major product (P) in the following reaction is :

A solution is 0.1 M in Cl^$$-$$ and 0.001 M in CrO$$_4^{2 - }$$. Solid AgNO₃ is gradually added to it. Assuming that the addition does not change in volume and K_sp(AgCl) = 1.7 $$\times$$ 10^$$-$$10 M² and K_sp(Ag₂CrO₄) = 1.9 $$\times$$ 10^$$-$$12 M³.

Select correct statement from the following :