The URD component used to join two wires together is:

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In URD systems, joining two buried conductors requires a joint that is designed to stay sealed and insulated in direct burial. A molded underground splice is specifically built for this purpose: it encases the two conductor ends in a weatherproof, moisture-resistant housing and provides a proper electrical and mechanical connection that can handle the system voltage. This type of splice is manufactured to match the cable size and voltage rating, and it often uses a gel or resin within the molded housing to keep moisture out and prevent corrosion.

The other options don’t fit because they serve different functions. A grounding elbow is for bonding a grounding path or terminating a ground conductor, not for splicing two conductors. A disconnect switch is used to open or close a circuit for isolation or control, not to join wires. A portable feed-through bushing is a through-wall device that allows a conductor to pass through a barrier, not a method for linking two conductors together.