Choose the best description of the methods used in veterinary practice to measure the total protein content of a sample. A) Total protein content can be measured using microscopic methods or chemical assays that detect peptide bonds. B) Total protein content can be measured using a refractometer or chemical assays that detect carbon. C) Total protein content can be measured using microscopic methods or chemical assays that detect carbon. D) Total protein content can be measured using a refractometer or chemical assays that detect peptide bonds.