The Main Feature of a Sole Licence for the Manufacture

The main feature of a sole licence for the manufacture of an invention is that:

A) the patent holder agrees to give the licensee exclusive rights but retains the personal right to exploit (use) the patent.
B) the patent holder agrees that only the licensee has the right to exploit the invention.
C) the licensee agrees that confidential reports on the progress of the manufacturing development will go solely to the patent holder.
D) the patent holder grants the licensee the sole rights to negotiate with retailers.