Answer: In multiple Availability Zones

## Explanation To achieve **high availability** for critical applications on AWS, deploying across **multiple Availability Zones (AZs)** is the recommended approach. ### Why Multiple Availability Zones? - **Fault Isolation**: Each Availability Zone is physically separate with independent power, cooling, and networking - **Automatic Failover**: If one AZ fails, the application can continue running in other AZs - **High Availability Architecture**: Multi-AZ deployments provide redundancy and resilience ### Why Not the Other Options? - **Single Availability Zone**: Creates a single point of failure - if that AZ goes down, the entire application goes down - **AWS Direct Connect**: This is for dedicated network connections, not for application deployment or high availability - **Reserved Instances**: This is a billing/pricing model for cost savings, not a deployment strategy for high availability ### Best Practice For mission-critical applications, AWS recommends deploying across at least **2-3 Availability Zones** within the same region to ensure continuous operation even during AZ-level failures.

Author: Ritesh Yadav