Consider the following electrochemical cell notation: M_(s) / M²⁺_(aq)// H⁺_(aq)/ H_2(g). The value of the electrode potential is positive when

A. electrons flow from the metal electrode, M_(s) to hydrogen electrode, H_2(g)  
B. electrons fow from hydrogen electrode, H_2(g) to metal electrode, M_(s)
C. the flow of current is high
D. there is equilibrium between the flow of electrons from the hydrogen electrode, H_2(g) to metal electrode, M_(s)

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Correct Answer: A