Which of the following tasks is prohibited for an assistant or technician?

The task of prescribing medications is prohibited for an assistant or technician because this role typically involves following the directives of a licensed veterinarian rather than making independent medical decisions. Prescription authority generally requires advanced training and licensure, which veterinarians possess. Veterinary technicians and assistants are critical in support roles, such as administering treatments prescribed by a veterinarian, but they do not have the legal authority to determine medication regimens or dosages for animals.

In contrast, administering vaccines, performing routine check-ups under a veterinarian's guidance, and assisting in surgeries fall within the responsibilities that a trained technician or assistant may carry out, provided they have received the appropriate training and supervision. These actions contribute significantly to animal care under the direction of licensed professionals.