[Introduction to Incident Handling and Response] In which of the following phases of the incident handling and response (IH&R) process is the identified security incidents analyzed, validated, categorized, and prioritized?

Incident triage is the initial phase in the incident handling process where potential security incidents are assessed. This phase involves analyzing incoming data or alerts to validate whether a genuine security incident has occurred. Once validated, the incident is categorized based on its type (e.g., malware, denial-of-service, unauthorized access) and then prioritized based on its potential impact and urgency. This ensures that resources are allocated effectively, with the most critical incidents receiving immediate attention. The core activities of analysis, validation, categorization, and prioritization are the defining functions of the incident triage phase.

B. Incident recording and assignment: This is a procedural step for documentation and delegation that occurs after or during triage, not the analytical process of validation and prioritization itself.
C. Containment: This is a subsequent phase focused on limiting the impact of a confirmed and prioritized incident, not the initial analysis and sorting of potential incidents.
D. Notification: This phase involves communicating with relevant stakeholders about a confirmed incident, which happens after the incident has been triaged and its severity is understood.

1. NIST Special Publication 800-61 Rev. 2, Computer Security Incident Handling Guide. Section 3.2.2, "Detection and Analysis," describes the activities that constitute triage. It states, "The analysis of an incident should determine its scope... This analysis is followed by incident validation... After an incident has been validated, the incident response team should perform incident prioritization..." These steps (analysis, validation, prioritization) are the essence of incident triage. (Page 21).

2. Carnegie Mellon University, Software Engineering Institute. Defining the Triage Function for a Computer Security Incident Response Team (CSIRT). This document explicitly defines the triage function. It states, "The triage function is responsible for receiving, initially investigating, and routing incoming information... The triage function must be able to analyze a report to determine what is happening, categorize the report, and prioritize the report." (CMU/SEI-2018-TN-011, Section 2, Page 3).

3. University of California, Berkeley, Security Policy. Incident Response Plan. The plan outlines the incident response lifecycle. In the "Triage" section, it details the process: "The Incident Handler performs triage by categorizing and determining the priority of the incident." This aligns directly with the activities mentioned in the question. (Section: Incident Response Process, Step 2: Triage).