The correct answer is B.
OBJ-2.1: Cyber, human, and physical are all recognized adversarial attack vectors in the framework. While the information may be exchanged in all of these factors, the term is too generic to uniquely describe any given attack vector under the MITRE ATT&CK framework. Cyber is the use of hardware or software IT systems. Human is the use of social engineering, coercion, impersonation, or force. Physical relies on gaining local access.