Design a reference architecture for three-tier applications (web, application, NoSQL) that must be highly available within a Region, support failover to another Region within 1 minute for disaster recovery, and minimize user impact and cost. Which combination of actions meets these goals? (Choose three.)

A Route 53 failover routing policy with a low TTL (30 seconds) enables rapid redirection of traffic to the DR Region, minimizing downtime. DynamoDB global tables provide active-active replication across Regions, ensuring data consistency and availability for the NoSQL layer without manual intervention. A hot-standby model with Auto Scaling groups across multiple AZs in both Regions ensures high availability within each Region and immediate capacity in the DR Region. Using Reserved Instances for baseline capacity and On-Demand for spikes optimizes cost while maintaining performance. Incorrect options: Weighted routing with a 100/0 split doesn't provide automatic failover; it requires manual intervention to change weights. A 1-hour TTL is too long for a 1-minute RTO. Backing up DynamoDB to S3 and then importing is a slow process, far exceeding the 1-minute RTO. Relying solely on Spot Instances for critical capacity is not suitable for a hot-standby DR strategy due to their ephemeral nature and potential for interruption, which compromises availability.