A solutions architect must optimize costs for an application that uses Amazon EC2 instances, AWS Fargate, and AWS Lambda. EC2 instances host the data ingestion layer, with sporadic and unpredictable usage; those workloads can be interrupted at any time. The front end runs on Fargate and the API layer runs on Lambda; both have predictable utilization for the next year. Which combination of purchasing options will be MOST cost-effective? (Choose two.)

Spot Instances are ideal for the data ingestion layer because its usage is sporadic and unpredictable, and the workloads can be interrupted. Spot Instances offer significant cost savings (up to 90% off On-Demand prices) for fault-tolerant workloads. A 1-year Compute Savings Plan is the most cost-effective option for the front end (Fargate) and API layer (Lambda) because both have predictable utilization for the next year. Compute Savings Plans offer flexible pricing across various compute services, including Fargate and Lambda, providing up to 66% savings compared to On-Demand. On-Demand Instances would be more expensive for the data ingestion layer than Spot Instances. All Upfront Reserved Instances are not suitable for the data ingestion layer due to its sporadic and interruptible nature. An EC2 instance Savings Plan would not cover Fargate or Lambda, making it less comprehensive than a Compute Savings Plan for the front end and API layer.