A nurse is helping an assistive personnel with documenting a client's fluid intake in the medical record. Which of the following values should the nurse identify as a metric unit?

A. 8 Tbsp: Tablespoons are household units of measurement and not part of the metric system, though are sometimes used in dietary contexts. B. 4 oz: Ounces are considered part of the U.S. customary system and not a metric unit, even though they may be seen occasionally in clinical settings. C. 0.5 cup: Cups are also part of household or U.S. customary units and should be converted to mL in medical records for accuracy. D. 120 mL: Milliliters are metric units and are preferred in clinical documentation for precision and standardization.