Which three statements about the BGP next-hop attribute are true？ （）
- AEBGP sessions between confederation sub ASs do not modify the next-hop attribute.
- BBy default， iBGP sessions change the next-hop attribute learned from eBGP peers to self address.
- CBy default， the next-hop attribute is not changed when a prefix is reflected by the route reflector
- DEBGP sessions between confederation sub ASs change the next-hop attribute to peer address.
- EBy default， iBGP sessions preserve the next-hop attribute learned from eBGP peers.