Management support is the primary consideration when developing an incident response plan, as it is essential for obtaining the necessary resources, authority, and commitment for the plan. Management support also helps to ensure that the plan is aligned with the organization’s business objectives, risk appetite, and security strategy, and that it is communicated and enforced across the organization. Management support also facilitates the coordination and collaboration among different stakeholders, such as business units, IT functions, legal, public relations, and external parties, during an incident response.

The definition of an incident (A) is an important component of the incident response plan, as it provides the criteria and thresholds for identifying, classifying, and reporting security incidents. However, the definition of an incident is not the primary consideration, as it is derived from the organization’s security policies, standards, and procedures, and may vary depending on the context and impact of the incident.

Compliance with regulations (B) is also an important factor for the incident response plan, as it helps to ensure that the organization meets its legal and contractual obligations, such as notifying the authorities, customers, or partners of a security breach, preserving the evidence, and reporting the incident outcomes. However, compliance with regulations is not the primary consideration, as it is influenced by the nature and scope of the incident, and the applicable laws and regulations in different jurisdictions.

Previously reported incidents (D) are a valuable source of information and lessons learned for the incident response plan, as they help to identify the common types, causes, and impacts of security incidents, as well as the strengths and weaknesses of the current incident response processes and capabilities. However, previously reported incidents are not the primary consideration, as they are not predictive or comprehensive of the future incidents, and may not reflect the changing threat landscape and business environment.

References = CISM Review Manual, 16th Edition, Chapter 4: Information Security Incident Management, Section: Incident Response Plan, page 181-1821

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