Context: 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.

Question: What cruise line has its headquarters in Southampton?
Answer: Carnival Corporation & plc

Question: Besides Carnival, what other major cruise line parks its record-breaking cruise ships in Southampton Water? 
Answer: Royal Caribbean

Question: In addition to P&O Cruises and Cunard Line, what other brand does Carnival Corporation own?
Answer: Princess Cruises