Answer : 3. "America, Britain and Australia"
Explanation :

The US, UK and Australia have signed a new agreement to build Australia's SSN-AUKUS submarines, marking a milestone in defense cooperation. ASC and BAE Systems will build submarines equipped for intelligence, surveillance and undersea warfare. SSN-AUKUS will enhance industrial cooperation, enhance collective capabilities and promote economic development in defense sectors. AUKUS aims to strengthen a strong submarine industrial base in the three countries while ensuring production and maintenance capabilities