Option A is correct.The storm control feature is enabled in the factory-default configuration on EX Series switches12.On EX2200, EX3200, EX3300, EX4200, and EX6200 switches, the factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces2.On EX4300 switches, the factory default configuration enables storm control on all Layer 2 switch interfaces1.

Option B is incorrect.The storm control feature does not require a special license on EX Series switches34.

Option C is incorrect. There's no information available that suggests the storm control feature is not supported on aggregate Ethernet interfaces.

Option D is incorrect.The storm control configuration applies to traffic at the ingress of an interface5, not just between the forwarding and control plane.