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Consider the equation Pr(A | B) = Pr(B | A). Assume all conditional probabilities are well-defined. Which one of the following is correct? O This equation always holds. O This equation never holds. O This equation only holds sometimes: whenever Pr(A | B) = Pr(A). O This equation only holds sometimes: whenever Pr(A) = Pr(B). O This equation only holds sometimes: whenever Pr(B) = 1