For which two reasons should organizations customize their incident response plans based on NIST SP...

Standards like NIST SP 800-61 provide a proven framework, but incident response must be operationalized to the organization’s reality. Customization is required to match mission, size, structure, and functions (D)—for example, whether the organization is regulated (financial/health), globally distributed, heavily supplier-dependent, or cloud-first. These factors determine evidence retention, legal notification triggers, escalation thresholds, and which teams own containment steps (email admin vs SOC vs IAM). Customization also improves effectiveness/efficiency by creating a repeatable process and documented handoffs (E): who triages TAP alerts, who executes TRAP pulls, who updates URL Defense blocklists, who performs account resets/token revocation, and how comms are handled with executives and end users. In Proofpoint-driven IR, handoffs are particularly important because email incidents often cross functional boundaries (SOC ↔ messaging team ↔ IAM ↔ helpdesk ↔ legal). Making plans “more generic” (A) is counterproductive; standards are already generic. Documenting every MSSP analyst contact (B) is fragile; role-based contacts are better, but that’s not the key reason for customizing a standard. Changing lifecycle order (C) is not the objective; improving fit and execution is.