 Explanation:

Convening key stakeholders to address a severe security threat is a classic example of a security incident response. It involves analyzing the threat, determining modifications to security controls, and mitigating the risk to the organization.

 Why Other Options Are Incorrect:

A. Change management: Change management refers to processes for systematic and planned modifications, not rapid responses to urgent threats.

B. Business continuity planning: This focuses on maintaining critical operations during disruptions, not responding to immediate security incidents.

D. Thought leadership: This pertains to driving strategic innovation or expertise, not operational incident response.

 EC-Council CISO Reference:

The incident response lifecycle, as outlined in the EC-Council program, stresses the importance of prompt coordination and action during security threats.