A hypothetical electrochemical cell is shown below: A | A+ (xM) || B+ (yM) | B The emf measured is +0.20V. The cell reaction is:

1. A. A+ + B -> A + B+
2. B. A+ + e- -> A; B+ + e- -> B
3. C. The cell reaction cannot be predicted
4. D. A + B+ -> A+ + B

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