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Priyanshu kumar Best Answer
Crystal structures show a very irregular 'tetrahedral' coordination with two sulphurs from methionine and cysteinate, and two histidine nitrogens(Bound to the copper center are four ligands: the imidazole groups of two histidine residues (His37 and His87), the thiolate of Cys84 and the thioether of Met92). In the reduced form of plastocyanin, His-87 becomes protonated. option C is correct