What is one way to fix the routing loop?

Click the Exhibit button.

In the exhibit, R1 is advertising a BGP route into both IS-IS and OSPF. There is mutual
redistribution from R1 and R2 into both OSPF and IS-IS.
The following traceroute is performed on R4:

What is one way to fix the routing loop?

A.
Option A

B.
Option B

C.
Option C

D.
Option D