what must be changed in the configuration?

Click the Exhibit button.

You are unable to establish a BGP session between R2 and ISP-B.
Referring to the exhibit, what must be changed in the configuration?

A.
A local address statement with the lo0 address must be added to R2 under group external-a.

B.
An import policy statement must be added to R2 under group external-a to allow ISP-B to peer.

C.
The type external statement must be added to R2 under group external-b.

D.
The peer-as statement needs the AS number for ISP-B.