World War II fighter planes could fly no more than 1,200 miles (1,931 km) before having to refuel. Engineers around the world solved this problem by building huge ships called aircraft carriers. Carriers transported fighter planes across the ocean. The planes could land on or take off from a carrier's long, flat top called the flight deck. The largest U. S. carriers were called Essex class. They were 888 feet (271 m) long with massive flight decks. The carriers fighter plane's range.

1. Measured?
2. Enforced?
3. Highlighted?
4. Extended?

wich one is?​