What is the concept of 'protein quality,' and how do PDCAAS and DIAAS approaches differ?

• A. Protein quality assesses amino acid adequacy and digestibility; PDCAAS caps at 1.0, DIAAS uses true ileal digestibility and is not capped.
• B. PDCAAS and DIAAS both cap at 1.0.
• C. Both use true ileal digestibility and are not capped.
• D. Protein quality is measured only by total protein content.

Answer: (A)