The correct option is D {∅,{1},{2},{1,2}}
The power set of any set S is the set of all subsets of S.
Consider S={1,2}
Note that empty set is a subset of every set and every set is a subset of itself.
Also, {1} and {2} are subsets of S with one element each.
ā¹The power set of S,P(S)={Ļ,1,2,{1,2}}