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A retail company has a three-tier web application with separate subnets for Web, Application, and Database tiers. The CTO at the company wants to monitor any malicious activity targeting the web application running on EC2 instances. You have been tasked with developing a solution to notify the security team in case the network exposure of EC2 instances on specific ports violates the security policies of the company. Which AWS Services would you use to build an automated notification system to meet these requirements with the least development effort? (Select two)