qwer: 4

Answer 1

If A is a finite set then set of all subset of A is called power set A denoted by P(A)

Here, A=$\{ \Phi \}$

P(A)=$\{ \Phi, \{ \Phi \} \}$

Hence,Option(B)$\{ \Phi, \{ \Phi \} \}$ is the correct choice.