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A leading e-commerce company has a payment portal that handles the payment and refund transactions of its online platform. The portal is hosted in an Auto Scaling group of On-Demand Amazon EC2 instances across three multiple Availability Zones in the US West (N California) region. There is a new requirement to improve the system monitoring of the application as well to track the number of payment and refund transactions being done every minute. The DevOps team should also be notified if this metric breaches the specified threshold. Which of the following options provides the MOST cost-effective and automated solution that will satisfy the above requirement?