Refer to the Exhibit.

Your employer is ISP A. Your customers must be able to reach customers of both ISP B and ISP C, but your network must not allow transit traffic between ISP B and ISP C at any time. Referring to the exhibit, what are two solutions? (Choose two.)

A.
Use policy to filter routes on AS number.

B.
Use the well-known no-export community.

C.
Use the MED to prefer the proper routes.

D.
Use communities to identify and filter routes.