Referring to the exhibit, how would you solve this problem?

Click the Exhibit button.

R5 must advertise Subnet A into IS-IS so that Subnet A and Subnet B can communicate. Subnet B must be able to forward traffic to Subnet A and towards Area 49.0001. However, R5 should not be able to route traffic from Subnet A to Area 49.0001.

Referring to the exhibit, how would you solve this problem?
A . Configure Level 2 on all links in Area 49.0002.
B . Configure the set protocols isis ignore-attached-bitparameter on R5.
C . Configure the set protocols isis overloadparameter on R6.
D . Configure an export policy on R6 to reject all routes except Subnet B towards R5.

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Answer: B