How would you use immuno gold staining to identify a specific protein in a cell sample?

• A. By coating the entire sample with gold to enhance contrast.
• B. By using gold nanoparticles to increase the sample's overall electron density.
• C. By embedding the sample in gold to preserve its structure.
• D. By attaching gold-labeled antibodies to the protein, making it appear as black spots in electron microscopy images.

Answer: (D)