You are writing a postmortem for an incident that severely affected users. You want to prevent similar incidents in the future. Which two of the following sections should you include in the postmortem? (Choose two.)

A. An explanation of the root cause of the incident. B. A list of employees responsible for causing the incident C. A list of action items to prevent a recurrence of the incident D. Your opinion of the incident's severity compared to past incidents E. Copies of the design documents for all the services impacted by the incident