Explanation
https://cloud.google.com/compute/docs/instance-groups/
Google Compute Engine enables users to launch virtual machines (VMs) on demand. VMs can be launched from the standard images or custom images created by users.
Managed instance groups offer autoscaling capabilities that allow you to automatically add or remove instances from a managed instance group based on increases or decreases in load. Autoscaling helps your applications gracefully handle increases in traffic and reduces cost when the need for resources is lower.

https://kubernetes.io/docs/tutorials/stateful-application/basic-stateful-set/

Explanation/Reference:
Explanation:
Storageguarantees 2 replicates which are geo diverse (100 miles apart) which can get better remote
latency and availability.
More importantly, is that multiregional heavily leverages Edge caching and CDNs to provide the content to
the end users.
All this redundancy and caching means that Multiregional comes with overhead to sync and ensure
consistency between geo-diverse areas. As such, it's much better for write-once-read-many scenarios.
This means frequently accessed (e.g. "hot" objects) around the world, such as website content, streaming
videos, gaming or mobile applications.
References: https://medium.com/google-cloud/google-cloud-storage-what-bucket-class-for-the-best-
performance-5c847ac8f9f2

Google Cloud Platform(GCP) enforces firewall rules through rules and tags. GCP rules and tags can be defined once and used across all regions.
Reference: https://cloud.google.com/docs/compare/openstack/
https://aws.amazon.com/it/blogs/aws/building-three-tier-architectures-with-security-groups/