Which AWS service or feature provides high availability and low latency within an AWS Region?

Explanations:

Edge locations are primarily used for content delivery via Amazon CloudFront to improve latency for end users outside of AWS Regions.

Availability Zones provide high availability and low latency within an AWS Region by distributing resources across isolated zones in the same region.

AWS Outposts extends AWS infrastructure and services to on-premises locations, but it is not designed for high availability within an AWS Region.

Amazon Route 53 is a scalable DNS and routing service that manages domain names and routing, but it does not directly provide high availability.