For all numbers x and y, let the operation be defined as x y =

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For all numbers x and y, let the operation ¤ be defined as x ¤ y = 2xy − 4x. If a and b are positive integers, which of the following can be equal to zero?
I. a ¤ b
II. (a − b) ¤ b
III. b ¤ (a − b)
A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III

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