An engineer must allow multiple external networks to communicate with internal ACI subnets. Which action should the engineer take to assign the prefix to the class ID of the external Endpoint Group?
A. Enable the Export Route Control Subnet for the External Endpoint Group flag.
B. Enable an L3Out with Shared Route Control Subnet.
C. Configure subnets with the External Subnets for External EPG flag enabled.
D. Configure subnets with the Import Route Control Subnet flag enabled.
