Utility company easement in gross

A utility company would create which of the following:

  1.  easement in gross.
  2.  a dominant tenement.
  3.  an easement by prescription
  4.  a freehold estate

The answer is A – an easement in gross.  An easement in prescription is only created by open and notorious use, but a utility company would use an easement in gross.  the other answers don’t apply.