Let X be a non-empty set and P(X) be a power set. Let * be a binary operation defined on the elements of P(X) by A*B = A intersection B, for all A,B belonging to P(X).
(i) Check whether * is a binary operation.
(ii) Verify whether * is associative on P(X).
(iii) Find the identity elements of P(X).
(iv) Find all invertible elements of P(X).
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