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An online data analytics application is launched to 12 On-Demand EC2 instances across three Availability Zones using a golden AMI in AWS. Each instance has only 10% utilization after business hours but increases to 30% utilization during peak hours. There are also some third-party applications that use the application from all over the globe with no specific schedule. In the morning, there is always a sudden CPU utilization increase on the EC2 instances due to the number of users logging in to use the application. However, its CPU utilization usually stabilizes after a few hours. A DevOps Engineer has been instructed to reduce costs and improve the overall reliability of the system. Which among the following options provides the MOST suitable solution in this scenario?