A). Single Network Appliance in a single AD: This offers minimal redundancy. If the appliance or the AD fails, your entire transitive routing functionality becomes unavailable.C. Multiple Network Appliances in a single AD with load balancing: While this improves performance and distributes traffic, it doesn,t provide true high availability for the routing function itself. If the entire AD fails, all appliances become unavailable.D. Single Network Appliance in a regional fault domain with high availability enabled: This might offer some redundancy within the fault domain, but it doesn,t protect against regional outages affecting the entire domain.Option B:
By deploying a Network Appliance in each availability domain (AD) within a region, you gain redundancy across different physical locations.
Configuring active-passive failover ensures that if one appliance fails, the other immediately takes over, minimizing downtime and disruption to your transitive routing.
This approach offers fault tolerance at both the appliance and the AD level, significantly enhancing availability compared to the other options.