What is it called when nutrients essential to life are provided directly into the bloodstream?

Question

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Total parenteral nutrition (TPN) is a method of feeding that delivers a balanced mixture of essential nutrients (carbohydrates, protein, fat, vitamins, minerals, and electrolytes) directly into the bloodstream through a central vein. TPN is used when the patient's digestive system is unable to absorb nutrients from food, or when the patient is unable to eat or drink for an extended period of time. Enteral feeding (A) and tube-feeding (B) involve feeding through the gastrointestinal tract, usually through a feeding tube, and are used when the patient is unable to eat or swallow but can still digest food. Force feeding (D) is a controversial practice in which food is forcibly given to a person who does not want to eat, and is typically not done for medical purposes.

What Is It Called When Nutrients Essential to Life Are