What must be configured to redistribute externally learned OSPF routes within the ACI fabric? 

Answer options:

A. Route Control Profile
B. BGP Route Reflector
C. BGP Inter-leak Route Map
D. PIM Sparse Mode

B

Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/ACI_Best_Practices/b_ACI_Best_Practices/ b_ACI_Best_Practices_chapter_010010.html