Final answer:
D.) both ""a"" and ""b"". E) and V) codes are located in the Tabular List of Diseases and are assigned when a circumstance other than a disease or injury is present.
Step-by-step explanation:
Both A) E and B) V codes are located in the Tabular List of Diseases and are assigned for patient encounters when a circumstance other than a disease or injury is present. E codes are used for external causes of injury, such as accidents or poisonings, while V codes are used for factors influencing health status and contact with health services. These codes help provide additional information about the patient's condition or reason for the encounter and assist in tracking and reimbursement purposes.