The electrode is the anode in a galvanic cell should be option d. The electrode with the highest oxidation potential.
What is an electrode?
The electrode should be lies in the left half-cell to represent the anode since oxidation should be arise here.
Here the flow of anions should be in the salt that bridges towards it. In the right half-cell that represent the cathode since the reduction arise here.
Hence, the option d is correct.
And the rest of the options are wrong.
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