Q1 — Memory-optimized instances

A financial application processes large in-memory datasets and requires the lowest possible latency for RAM-bound computations. Which EC2 instance family is most appropriate?


Q2 — Spot instances for batch

A batch processing job runs nightly for 6 hours, is fault-tolerant, and can resume from a checkpoint if interrupted. Cost minimization is the top priority. Which purchasing option is best?


Q3 — Reserved Instances for steady-state baseline

A company runs a web application with a predictable baseline of 10 instances running 24/7 for the next 3 years. Additional On-Demand instances handle peak traffic. How should the baseline be purchased?