Final answer:
The CEO has requested a Tabletop exercise, which is discussion-based and includes a scenario creation, involvement of stakeholders, a biannual review, and reporting on findings.
Step-by-step explanation:
The CEO has requested an exercise that includes the involvement of business owners and stakeholders, the creation of an applicable scenario, a biannual verbal review of the incident response plan, and a report on lessons learned and gaps identified. Considering the activities requested by the CEO, the exercise in question would be Tabletop. This exercise type is a discussion-based session where team members meet in an informal setting to discuss their roles during an incident and walk through different scenarios. Such exercises are essential for validating the effectiveness of communication and procedural components of the incident response plan without the stress of an actual emergency.