Which two statements are true about BGP?

Which two statements are true about BGP? (Choose two.)

A.
The BGP next-hop attribute must always be set to a non-private IP address when peering with a service provider.

B.
The as-path attribute tracks loops within an autonomous system.

C.
The BGP next-hop attribute is automatically updated when sending routes to an external peer on a point-to-point link.

D.
The as-path attribute is automatically updated when sending routes to an external peer.