D is right. High availability = minimal downtime = recovery quickly from failure. Agility is about how quickly something is deployed.
https://aws.amazon.com/marketplace/solutions/infrastructure-software/high-availability
By building a highly available architecture, organizations can minimize or eliminate the impact of failures on their applications and services. This is achieved through strategies such as redundancy, fault tolerance, and automatic failover. When failures occur, the architecture is designed to quickly and seamlessly recover and continue providing services to users, thereby minimizing or avoiding any downtime.
A - no because it’s quickly adapting to changing business needs
B - no because it’s about dynamically provision/de-provision resources
C - no because it’s about increasing workloads to handle increasing workloads
D - yes
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