The metal salts formed during softening of hardwater using Clark's method are :

Given below are two statements.

Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.

Statement II : Density of hydrogen peroxide at $$298 \mathrm{~K}$$ is lower than that of $$\mathrm{D}_{2} \mathrm{O}$$.

In the light of the above statements, choose the correct answer from the options given below.

Which of the following can be used to prevent the decomposition of $$\mathrm{H}_{2} \mathrm{O}_{2}$$ ?