Which of the following statements would describe the term "incident" when used in the branch of security known as Incident Handling? (A) Any observable network event (B) Harm to systems (C) Significan

Pairing A with C omits actual harm to systems (B), which is a core requirement of an incident definition, making this combination technically incomplete.

Including C (significant threat of harm) incorrectly elevates an unactualized threat to incident status; a significant threat that has not yet caused harm belongs in threat or vulnerability assessment, not incident response.

This pairing excludes the observable event component (A), which is foundational to incident classification, and incorrectly includes a threat that has not materialized as harm.

Statement A (any observable network event) and statement B (harm to systems) together define an incident because every incident must first be an observable occurrence and must result in actual damage or compromise. NIST SP 800-61r2 frames an incident as an observable violation of security policy that causes harm, combining both characteristics while excluding unactualized threats from the incident category.