Which one of the following countries recently signed a new agreement to build Australia’s SSN-AUKUS submarines?

An important step forward in defense cooperation has been taken by the US, UK, and Australia with the formation of a new agreement to build Australia's SSN-AUKUS submarines. The submarines, outfitted for underwater warfare, intelligence gathering, and surveillance, will be constructed by ASC and BAE Systems. SSN-AUKUS will promote economic growth in the defense industry, strengthen collective capacity, and improve industrial collaboration. AUKUS seeks to ensure production and maintenance capabilities by strengthening a strong submarine industrial base among the three countries.