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Best answer
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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.

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Shouldn't the answer be {o, {}}, where o is the empty set or ϕ
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Answer: B

let A be any set, then the set of all subsets of A is called power set of A
To understand this question better let’s try to understand it with another example
A = { }
P(A) = {Ф}

A = {a}
P(A) = {Ф, {a}}

A = {a, b}
P(A) = {Ф, {a}, {b}, {a, b}}

A = {Ф}
P(A) = {Ф, {Ф}}

Answer:

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