This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
A common electrolyte used for plating copper indirect dies is: 
Select and explain. 
A. Copper cyanide, B. Ionic copper, C. Acidic copper sulfate, D. Silver cyanide
C: Acidic copper sulfate
Answer: C: Acidic copper sulfate 
Explanation: None