Which of the following is not a metadata feature of the Diamond Model?

Direction is a valid Diamond Model meta-feature that describes the flow of the attack relative to the infrastructure and victim.

Result is a valid Diamond Model meta-feature that captures the outcome of the adversary's action, such as success, failure, or unknown.

The Diamond Model's meta-features include Timestamp, Phase, Result, Direction, Methodology, and Resources - but 'Devices' is not a defined meta-feature in the model. Meta-features augment the four core features (Adversary, Capability, Infrastructure, Victim) and 'Devices' does not appear in Caltagirone et al.'s original specification of the model.

Resources is a valid Diamond Model meta-feature that describes the external resources required by the adversary to execute the capability.