To notify a response team when a high-security web server returns a 403 Forbidden error, two key steps are required. First, define a metric filter for Apache logs in CloudWatch to detect the 403 error code within the log data. This involves setting up a filter pattern to match '403' in the Apache access logs. Second, create an alarm for the metric filter and configure it to deliver alerts using Amazon SNS, which supports email or other notifications to the response team. The WGU Cloud Deployment and Operations Study Guide (Section 4.2, CloudWatch Logs and Alarms) confirms that metric filters and SNS-integrated alarms are the standard approach for monitoring and alerting on log-based events. Options B and D are incorrect as they involve unnecessary or unsupported configurations (e.g., binding Lambda to Apache or using SQS for alarms).