Many of the world's largest cruise ships can regularly be seen in Southampton water, including record-breaking vessels from Royal Caribbean and Carnival Corporation & plc. The latter has headquarters in Southampton, with its brands including Princess Cruises, P&O Cruises and Cunard Line.
In addition to P&O Cruises and Cunard Line, what other brand does Carnival Corporation own? (If the question is unanswerable, say "unanswerable")
Princess Cruises