Refer to the exhibit. You are a network designer for AS65100, which buys transit from AS65200 and AS65300. AS65200 and AS65300 have a peering relationship and they both implement RFC1998. You must…

MED (Multi-Exit Discriminator) allows AS65100 to advertise the same prefix through multiple border routers with different MED values - a lower MED signals to the transit provider that the corresponding entry point is preferred, steering inbound traffic to the closest border router without any manual reconfiguration if a session fails.

Although RFC1998 communities influence a transit provider's local preference, this method depends on provider-specific community support and does not directly guarantee hot-potato routing to the closest AS65100 border router in a deterministic way across both transit providers.

BGP remote trigger black hole is a technique for null-routing unwanted traffic by signaling a discard route, not a mechanism for steering inbound traffic to a specific preferred border router.

Selective route advertisement can change which prefixes are reachable via a given path but does not reliably enforce closest-router entry for all prefixes and may require manual updates when topology changes occur.

AS-path prepending on routes advertised through less preferred border routers artificially lengthens the AS path, causing transit providers to select the shorter-path route through the preferred (closest) entry point; since route withdrawal is automatic upon BGP session failure, this mechanism requires no manual intervention to maintain correct traffic flow.