Frank owned two adjacent parcels, Blackacre and Whiteacre. Blackacre fronts on a poor unpaved public road, while Whiteacre fronts on Route 20, a paved major highway. Fifteen years ago, Frank conveyed to his son, Sam, Blackacre "together with a right-of-way 25 feet wide over the east side of Whiteacre to Route 20." At that time, Blackacre was improved with a 10-unit motel. Ten years ago, Frank died. His will devised Whiteacre "to my son, Sam, for life, remainder to my daughter, Doris." Five years ago, Sam executed an instrument in the proper form of a deed, purporting to convey Blackacre and Whiteacre to Joe in fee simple. Joe then enlarged the motel to 12 units. Six months ago, Sam died and Doris took possession of Whiteacre. She brought an appropriate action to enjoin Joe from using the right-of-way. In this action, who should prevail?
Doris, because merger extinguished the easement.  Doris, because Joe has overburdened the easement.  Joe, because he has an easement by necessity.  Joe, because he has the easement granted by Frank to Sam