A company's SAP application uses a backend SQL Server database on-premises. The company will migrate the application and database to AWS. Performance data shows both the SAP application and the database have high memory utilization. Which instance-family choice meets these requirements?

The problem statement explicitly mentions high memory utilization for both the SAP application and the SQL Server database. Memory-optimized instances (R, X, or z1d families) are specifically designed for workloads that process large datasets in memory, such as high-performance databases, distributed web-scale in-memory caches, and enterprise applications like SAP HANA. Therefore, using memory-optimized instances for both components directly addresses the identified performance bottleneck. Compute-optimized instances are for CPU-intensive workloads, not high memory. Storage-optimized instances are for high I/O performance and large datasets, not primarily memory. HPC-optimized instances are for tightly coupled high-performance computing, which is not typical for standard SAP or SQL Server deployments.