What is a VPC and what is the scope of a VPC within AWS?

virtual private cloud, VPCs are regional in their scope and can exist in only one region

How can accidental deletion be controlled in S3?

enable features like Versioning, Object Lock, and Multi-Factor Authentication (MFA) Delete

Can a subnet exist within a VPC?

yes

Can a subnet span across multiple AZs?

no

what are the benefits of s3?