A web application must remain available if an entire Availability Zone fails. Which combination BEST meets this requirement?

• Single-AZ RDS instance with daily snapshots
• ALB across two AZs + Auto Scaling group with instances in at least two AZs
• One large EC2 instance with Elastic IP
• Route 53 simple routing to a single public IP

You need to buffer a burst of orders so downstream payment processors are not overwhelmed. What should you add?

• Amazon SNS topic only
• Amazon SQS queue between the API and workers
• AWS CloudTrail
• Amazon CloudFront

An RDS PostgreSQL database needs automatic failover within a Region for high availability but does NOT need additional read capacity. What should you enable?

• Cross-Region read replica
• Multi-AZ deployment
• RDS read replica in the same AZ
• DynamoDB global tables

Messages on an SQS queue fail processing repeatedly. Where should they land for troubleshooting without blocking the main queue?

• Amazon SNS topic
• Dead-letter queue (DLQ)
• Amazon EventBridge archive
• AWS Backup vault

A company needs the LOWEST cost DR approach and can accept RTO of several hours. Which strategy fits BEST?

• Multi-site active/active across two Regions
• Warm standby with always-on full stack
• Backup and restore using AMIs and database snapshots to S3
• Pilot light with Aurora Global Database active-active