Hal Divelbiss owned a corner lot located next to an elementary school.Children from the neighborhood cut across the lot diagonally as they were walking to school.The children did so with such frequency that there was a visible path across Hal's property.The children had been using the path since the school opened in 1971.On December 1, 2000, Hal placed a fence around the perimeter of the lot and the children could no longer use their well-established short cut.The school and the children:

a.Have an irrevocable license.

b.Have acquired an easement by prescription.

c.Have no rights to the path.

d.Have acquired an easement by necessity.