Determine whether each of these sets is the power set of a set, where a and b are distinct elements.

a) ∅

b) {∅, {a}}

c) {∅, {a}, {∅, a}}

d) {∅, {a}, {b}, {a, b}}

Determine whether each of these sets is the power set of a set, where a and b are distinct elements.

a) ∅

b) {∅, {a}}

c) {∅, {a}, {∅, a}}

d) {∅, {a}, {b}, {a, b}}