Your company’s Cisco routers are operating with EIGRP. You need to join network with an acquisition’s heterogeneous routers at 3 sites, operating with EIGRP and OSPF. Which describes the best practice for routing protocol deployment?

A.
apply OSPF throughout both networks

B.
apply one-way redistribution exclusively at each location

C.
apply two way redistribution exclusively at each location

D.
apply two-way redistribution at each location with a route filter at only one location

E.
apply two-way redistribution at each location with a route filter at each location

F.
apply EIGRP with the same autonomous system throughout both networks

Explanation:
Without filters there is possibility of routing loops. Link: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009487e.shtml