You are configuring an ACI fabric with Layer 3 out connectivity. You want to allow traffic to traverse from one external EPG to another external EPG, or alternatively to another internal EPG. Which option must be configured to permit the packets between these two EPGs, assuming the subnet is already being advertised correctly? 

Answer options:

A. Aggregate Export
B. Security Import Subnet
C. Export Route Control
D. Import Route Control
E. Aggregate Import

B