How does the AWS global infrastructure offer high availability and fault tolerance to its users?

A. The AWS infrastructure is made up of multiple AWS Regions within various Availability Zones located in areas that have low flood risk, and are interconnected with low-latency networks and redundant power supplies.
B. The AWS infrastructure consists of subnets containing various Availability Zones with multiple data centers located in the same geographic location.
C. AWS allows users to choose AWS Regions and data centers so that users can select the closest data centers in different Regions.
D. The AWS infrastructure consists of isolated AWS Regions with independent Availability Zones that are connected with low-latency networking and redundant power supplies.