Which of the Following Best Describes a Characteristic of a Legend

Which of the following best describes a characteristic of a legend drug?

A) Requires a special form (DEA) to be completed prior to ordering
B) May only be used by or under the supervision of a licensed Veterinarian
C) A current controlled substance license number must be on file with the vendor when an order is placed
D) May be used or prescribed in any manner that a licensed Veterinarian deems appropriate