A Solutions Architect needs to convert potential single points of failure to a highly-available configuration. The current architecture contains Amazon EC2 instances with databases running in one Availability Zone. Web-tier resources have not been given public addresses, but still require Internet access.
Which solution should the Architect use to maintain high availability?
A. Use ELB Classic Load Balancer with the web tier. Deploy EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy a NAT gateway in one
Availability Zone.
B. Use ELB Classic Load Balancer with the web tier. Deploy EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy NAT gateways in both
Availability Zones.
C. Use ELB Classic Load Balancer with the database tier. Deploy Amazon EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy NAT gateways in both Availability Zones.
D. Use ELB Classic Load Balancer with the database tier. Deploy Amazon EC2 instances in two Availability Zones and enable Multi-AZ RDS. Deploy a NAT gateway in one Availability Zone.

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