What is one method an ISP can use to reduce the BGP requirements within the ISP network core?

A.
Use MPLS within the ISP network core.

B.
Use MPLS to connect to multihomed customers.

C.
Carry the external routes using an IGP like IS-IS.

D.
Use recursive routing to reach the BGP next hop.

E.
Redistribute the external routes into MPLS.