The correct answer is D.
OBJ-1.2: OpenIOC is essentially just a flat database of known indicators of compromise. The MITRE ATT&CK provides additional details about detection and mitigation. The Diamond model is an analytic framework for describing an attacker’s work. Lockheed Martin’s cyber kill chain provides a generalized concept for how an attacker might approach a network but does not deal with individual IOCs’ specifics.