Final answer:
Carrier pigeon is not a commonly used transmission method for HIPAA claims.
Step-by-step explanation:
The correct answer is c. Carrier pigeon. Carrier pigeon is not a commonly used transmission method for HIPAA claims. HIPAA, which stands for the Health Insurance Portability and Accountability Act, requires healthcare providers to use secure and confidential methods of transmitting patient information. Although fax, secure email, and electronic data interchange are commonly used methods in the healthcare industry, the use of carrier pigeons is not secure or reliable enough to meet the HIPAA requirements.