How do you choose GCE machine families (E2, N2, C2, M, Tau)?

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GCP questions focus on global networking, managed data services, IAM, and designing resilient workloads on Google Cloud. How do you choose GCE machine families (E2, N2, C2, M, Tau)? — explain the concept clearly, tie it to a real production scenario, and mention trade-offs and fa…