A customer requires Oracle Cloud Infrastructure Classic to have multiple VPN appliances for high availability (HA). They have created two VPNaaS gateways in Oracle Cloud Infrastructure Classic: VPN1 and VPN2.
Which option enables you to route traffic to the customer?
A. To enable cloud failover between VPN1 and VPN2, create a VNICSet with only the VPN1 vNIC. Set the default route to this VPN1 vNICSet. Tell the customer to update the route to the VPN2 vNICSet manually if VPN1 fails.
B. Tell the customer that Oracle Cloud does not support HA for VPNaaS.
C. To enable automatic cloud failover between VPN1 and VPN2, create two VNICSets: VPN1-vNICSet and VPN2-vNICSet. Create two routes that use these vNICsets and ensure that the route using VPN1vNICset has a lower administrative distance.
D. To enable cloud failover between VPN1 and VPN2, create a vNICSet with both VPN1 and VPN2 vNICs. Create a route that uses this vNICset. Advise the customer that the only way to enable HA is to use Equal Cost Multipathing (ECMP) and allow asymmetric routing at their end.
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