Bob is in love with Alice, but sadly, Alice has no interest in Bob. Every time Bob tries to approach Alice, she evades Bob. Let X be the physical distance that Bob has travelled towards Alice, and Y be the physical distance that Alice has travelled away from Bob. What is the most likely expression of the correlation between X and Y? O a. p(X, Y) = 0 O b. p(X, Y) is undefined. O c. p(X, Y) > 0 O d. p(X, Y) <0

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