Final answer:
The maximum hang time for supplemental feeding formula in a closed system is typically recommended to be 12 hours to prevent bacterial contamination and ensure patient safety.
Step-by-step explanation:
The maximal hang time for supplemental feeding formula in a closed system is often recommended to be no more than 8 to 12 hours, to minimize the risk of bacterial growth and ensuring the safety of the patient. While some guidelines may vary, the most common recommendation aligns with the option stating that the maximum hang time is 12 hours (b). This practice is particularly important in healthcare settings to prevent infections and ensure the safety and health of patients receiving enteral nutrition.