How can you prevent routing loops when performing mutual redistribution between two OSPF domains on multiple routers?

How can you prevent routing loops when performing mutual redistribution between two OSPF domains on multiple routers?
A . No action is required, OSPF prevents routing loops by design
B . Make sure that the redistributing routers are members of Area 0 in both OSPF domains
C . Redistribute only external routers between the OSPF domains
D . Prevent routers from being redistributed into their original OSPF domain

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Answer: D