A compute-optimized instance will be used for SageMaker training 35 hours per week for the next 55 weeks, and the company wants to lower training costs. Which option best reduces cost given these requirements?

The correct option is to use a SageMaker Savings Plan with a 1-year term and an All Upfront payment. This is the most effective way to reduce costs for a consistent, long-term workload like 35 hours per week for 55 weeks (over a year). Savings Plans offer significant discounts compared to on-demand pricing in exchange for a commitment to a consistent spend. An All Upfront payment typically provides the largest discount. Using a serverless endpoint is for inference, not training, and would not be cost-effective for this scenario. SageMaker Edge Manager is for deploying models to edge devices, not for cloud-based training. While SageMaker Training with a heterogeneous cluster allows for flexible resource allocation, it doesn't inherently reduce costs as much as a Savings Plan for a predictable, long-term workload.