The investigator is using the feature that modifies retention policies for log groups. In Amazon CloudWatch, logs are organized into log groups, and each group has a configurable retention setting. This setting dictates how long the log events are stored. By adjusting this policy, the investigator can extend the storage duration for specific logs relevant to the investigation, ensuring critical evidence is not automatically deleted, which directly matches the action described in the scenario.

A. This describes the general purpose of CloudWatch Logs but not the specific action of adjusting storage duration.

B. CloudWatch Logs Insights is a query tool for searching and analyzing log data, not for managing its retention period.

D. This describes setting up CloudWatch Alarms or EventBridge rules, which are for real-time monitoring and alerting, not log storage management.

- AWS CloudWatch Logs User Guide. (n.d.). Work with log groups and log streams. Amazon Web Services

Inc. Retrieved from https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/Working-with-log-groups-and-streams.html. In the section "Change log data retention in CloudWatch Logs

" the documentation states

"By default

log events are stored in CloudWatch Logs indefinitely. However

you can configure how long to store log events in a log group. This is called the log group's retention policy."

- School of Public Health

University of Michigan. (n.d.). CloudWatch Logs. In Computing Resources. Retrieved from https://sph.umich.edu/computing/research-computing/aws/services/cloudwatch-logs.html. The documentation notes

"You can change the log retention policy for each log group at any time."