Which BGP option is required when load sharing over multiple equal-bandwidth parallel links from
a single CE router to a single ISP router over eBGP?

A.
eBGP Multipath

B.
eBGP Multihop

C.
BGP Synchronization

D.
Public AS numbers

Explanation:
The eBGP multihop allows a neighbor connection between two external peers that do not have
direct connection. The multihop is only for eBGP and not for iBGP. For example, in the topology
below router A wants to establish neighbor relationship with the loopback0 of router B (to allow
load balancing), which does not have direct connection so it must use “ebgp-multihop”

For your reference, the full configurations of both router A & B are shown below:

Note: If router B wants to establish neighbor relationship with the directly connected interface of
router A, it only needs these commands:

But notice the traffic from router B would be sent to 172.16.10.2 interface only and load balancing
would not take place.
(Reference:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml)