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Which of the following statements concerning a metal crystallized in a face-centered cubic cells/are CORRECT? 1. One metal atom is located on each face of the unit cell, where it is shared equally between four unit cells. 2. One metal atom is located at the center of the unit cell. 3. A metal atom is located at each of the eight lattice points, where it is shared equally between eight unit cells. A. 1 only B. 2 only C. 3 only D. 1 and 3 E. 1,2 and 3