An alternate airport is not required to dispatch a flag air carr

An alternate airport is not required to dispatch a flag air carrier airplane for a flight of less than 6 hours when the visibility for at least 1 hour before and 1 hour after the ETA at the destination airport is forecast to be

A.2 miles or greater.

B.at least 3 miles, or 2 miles more than the lowest applicable minimum.

C.3 miles.

正确答案是B