Which  one of  the following acts as stabilizer for ${\mathrm{H}}_2{\mathrm{O}}_2$ ?

H₂​O_2​ decomposes slowly on exposure to light 

2H_2​O₂(l)​→2H_2​O(l)​+O₂ (l)​
In the presence of metal surfaces or traces of alkali (present in glass containers), the above reactions is catalyzed. It is, therefore stored in wax-lined glass or plastic vessels in dark. Urea be added as a stabliser.