For a set A, the power set of A is denoted by 2^A. If A = {5, {6}, {7}}, which of the following options are TRUE?

I. Φ ϵ 2^A

II. Φ ⊆ 2^A

III. {5, {6}} ∈ 2^A

IV. {5, {6}} ⊆ 2^A