For a mission-critical application that requires 99.99% availability, which ECS networking solution components should be implemented?

For a mission-critical application that requires 99.99% availability, which ECS networking solution components should be implemented?
A . Multiple Availability Zones deployment
B . Single instance deployment in one Availability Zone
C . Application Load Balancers with health checks
D . Network Load Balancers for TCP traffic

Answer: ACD