What type of anesthesia is administered both by inhalation and intravenously?

General anesthesia is the correct choice because it is specifically designed to induce a complete loss of consciousness and sensation throughout the body during surgical procedures. This type of anesthesia can be administered through several routes, including both inhalation and intravenous methods.

Inhalational anesthetics involve administering gases or vapors that the patient breathes in, which quickly impacts the central nervous system, leading to unconsciousness and the desired surgical anesthesia effect. Conversely, intravenous anesthetics are administered through an IV line, allowing for rapid onset of anesthesia by directly entering the bloodstream.

Regional anesthesia, on the other hand, involves anesthetizing a specific area of the body, often through nerve blocks, which does not involve systemic effects throughout the body. Specific and preoperative do not refer to distinct methods of administration, making general anesthesia the only suitable answer in this context.