Fiona owns two adjacent parcels, Redacre and Blueacre. A public highway adjoins Redacre. To reach Blueacre, Fiona travels from the highway along a gravel road over Redacre until she reached Blueacre. Blueacre does not adjoin a public road. Fiona sells Blueacre to George. The deed conveying title to George expressly provides that George will not receive an easement to cross Redacre. Three days after the closing, Fiona gives George a license to cross Redacre to reach Blueacre. But one week later, Fiona revokes the license. Which of the following is correct?
a. George has an implied easement by prior existing use to cross Redacre
b. George has an easement by necessity to cross Redacre
c. George has no right to cross Redacre
d. George has an irrevocable license to cross Redacre