Determine which of these relations are symmetric. The variables x, y, x', y represent integers. A. ~ y if and only if x + 2y is positive. ~ y if and only if x + y is even. B. C. ~ y if and only if x + y is positive. D.I~ y if and only if x - y is positive. E.I~ y if and only if x - y is a multiple of 10.

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