Which of the following is NOT one of the four enteral routes of administration?

The correct answer is identified as intravascular. The enteral routes of administration pertain specifically to the delivery of medications via the digestive system. This includes the oral route, where substances are taken through the mouth; the sublingual route, where substances are placed under the tongue for absorption; and the rectal route, where medications are administered through the rectum.

In contrast, intravenous administration involves delivering medications directly into the bloodstream, bypassing the digestive system entirely. This method is considered a parenteral route, which is distinct from enteral routes as it does not utilize the gastrointestinal tract for absorption. Understanding these distinctions is crucial for determining the appropriate method of medication administration based on the patient's needs and the pharmacological properties of the drug in question.