Refer to the exhibit. A customer is deploying a WAN with these requirements: - Routers 1 and 2 must receive only routes 192.168.11.0/24 and 192.168.21.0/24 from the Cisco ACI fabric. - Reachability…

Configuring subnets as 'Private to VRF' means they are local to the VRF and will not be advertised externally from the fabric, directly contradicting the requirement for WAN routers to receive these routes.

Configuring subnets as 'Private to VRF' means they are local to the VRF and will not be advertised externally from the fabric, directly contradicting the requirement for WAN routers to receive these routes.

To export specific subnets from the Cisco ACI fabric to external WAN routers, such as 192.168.11.0/24 and 192.168.21.0/24, these subnets within their respective Bridge Domains must be configured as 'Advertised Externally'. This setting explicitly directs ACI to inject these routes into the external routing protocol used for WAN connectivity, fulfilling the requirement for routers 1 and 2 to receive them and enabling reachability for servers in vrf_prod from the WAN.

This option is identical to C, which is the correct configuration setting for advertising subnets externally from the ACI fabric.