The SmartSolutions IoT team is struggling with their growing sensor network. IoT sensors send data to Node.js API servers on EC2 behind an Application Load Balancer, storing it in a 4 TB RDS MySQL DB instance, but the API servers are overloaded and RDS shows high write latency due to the increasing number of sensors. Which of the following steps together will resolve the issues permanently, enable growth as new sensors are provisioned, and keep this platform cost-efficient? (Choose two.)