Explanation
The best way to support effective communication during information security incidents is to have predetermined service level agreements (SLAs) because they define the expectations and responsibilities of the parties involved in the incident response process, and specify the communication channels, methods, and frequency for reporting and updating on the incident status and resolution. Frequent incident response training sessions are not very effective because they do not address the communication needs or challenges during an actual incident. Centralized control monitoring capabilities are not very effective because they do not address the communication needs or challenges during an actual incident. Responsibilities defined within role descriptions are not very effective because they do not address the communication needs or challenges during an actual incident. References:
https://www.isaca.org/resources/isaca-journal/issues/2017/volume-5/incident-response-lessons-learned
https://www.isaca.org/resources/isaca-journal/issues/2018/volume-3/incident-response-lessons-learned