You have deployed two network virtual appliances in the us-central1 region to provide connectivity to your on-premises network (10.0.0.0/8). You need to configure routing in your Virtual Private Cloud (VPC) to meet these requirements:

• All traffic to the on-premises network must route through the network virtual appliances.
• On-premises access must remain available if one network virtual appliance fails.
• Both appliances must be utilized simultaneously for load balancing.

What routing configuration should you implement?