Refer to the exhibit. R1 and R2 belong to the RIP routing domain that includes the networks 10.20.0.0/16 and 10.21.0.0/16. R3 and R4 are performing two-way route redistribution between OSPF and RIP. A network administrator has discovered that R2 is receiving OSPF routes for the networks 10.20.0.0/16 and 10.21.0.0/16 and a routing loop has occurred.

Which action will correct this problem?

A.
Apply an inbound ACL to the R2 serial interface.

B.
Change the RIP administrative distance on R3 to 110.

C.
Configure distribute-lists on R3 and R4.

D.
Set the OSPF default metric to 20.

E.
Change the OSPF administrative distance on R3 to 110.