Find the number of elements in the power set of {1,2}
Choose the correct choice from the following choices
A) 4	B) 0	C) 2	D) 3	E) 5

Rationale: "power set is the set of subsets of { 1,2 } that is { { 1,2 } , { 1 } , { 2 } , f } answer : a"
Answer: A