A company is concerned that two NAT instances in use will no longer be able to support the traffic needed for the company’s application. A solutions architect wants to implement a solution that is highly available, fault tolerant, and automatically scalable. What should the solutions architect recommend?

• ARemove the two NAT instances and replace them with two NAT gateways in the same Availability Zone.
• BUse Auto Scaling groups with Network Load Balancers for the NAT instances in different Availability Zones.
• CRemove the two NAT instances and replace them with two NAT gateways in different Availability Zones.
• DReplace the two NAT instances with Spot Instances in different Availability Zones and deploy a Network Load Balancer.