Final answer:
An organization should have an incident response plan primarily to (option 4) minimize the duration and impact of system outages and security incidents, ensure prompt communication of adverse events to relevant management, and contain costs related to maintaining disaster recovery plan capabilities.
Step-by-step explanation:
An organization should have an incident response plan primarily to minimize the duration and impact of system outages and security incidents. By having a plan in place, the organization can quickly identify and address any problems that may arise, thus reducing the potential downtime and disruption to their operations.
In addition, an incident response plan helps ensure prompt communication of adverse events to relevant management, allowing them to make informed decisions and take appropriate actions.
Furthermore, having a plan in place can also help in containing costs related to maintaining disaster recovery plan capabilities, as the organization can allocate resources more effectively and efficiently.