The coordination geometries around the copper ion of plastocyanin (a blue-copper protein) in oxidized and reduced form

Q. The coordination geometries around the copper ion of plastocyanin (a blue-copper protein) in oxidized and reduced form, respectively, are

(A) tetrahedral and square-planar

(B) square-planar and tetrahedral

(C) distorted tetrahedral for both

(D) ideal tetrahedral for both

Ans: distorted tetrahedral for both