(A) Nickel, Lead and Chromium
(B) Chromium, Copper and Nickel
(C) Gold, Sodium and Chromium
(D) Gold, Sodium and Potassium
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(A) Nickel, Lead and Chromium
(B) Chromium, Copper and Nickel
(C) Gold, Sodium and Chromium
(D) Gold, Sodium and Potassium