The correct answer for the length of a nautical mile is option 4, which is 6080 feet.

Option 1, 5060 feet, is incorrect. A nautical mile is longer than that.

Option 2, 5280 feet, is also incorrect. This is the length of a statute mile, not a nautical mile. A statute mile is the standard unit of measurement used in the United States.

Option 3, 6060 feet, is incorrect as well. It is closer in length to a nautical mile than the previous two options, but still not accurate.

The actual length of a nautical mile is 6080 feet. It is defined as one minute of latitude, which is a unit of measurement used for navigation and measuring distances at sea. Since the Earth is not a perfect sphere, but slightly oblate, the length of a nautical mile varies slightly depending on the latitude, but 6080 feet is the standard approximation.