A = {a, b, c}. f: P(A) ? P(A). For X ? A, f(X) = X ? {a}. Select the correct statement about the inverse of f. a. f^-1 = f b. f^-1(X) = X ? {a} c. f^-1(X) = X - {a} d. f does not have a well-defined inverse.
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