Refer to the exhibit. An architect must design a solution to connect the two ASs. To optimize bandwidth, the design will implement load sharing between router R6 and router R4. Which solution should…

Using `update-source` with a Loopback interface is a best practice for iBGP peerings to ensure BGP session stability and reachability, but it does not enable load sharing across eBGP paths.

The attribute is `next-hop-self`, not `next-hop-serf`, and it is typically used for iBGP peers to ensure reachability to external networks, not for load sharing between eBGP peers.

Configuring eBGP multihop by increasing the TTL (Time-to-Live) allows eBGP peers to be more than one hop away, which is useful for non-directly connected peers, but it does not enable load sharing across multiple paths.

The `maximum-paths` command in BGP allows a router to install multiple paths for the same destination prefix into the routing table, enabling load sharing across these parallel eBGP connections. This directly addresses the requirement to optimize bandwidth by distributing traffic over multiple links between R6 and R4.