Rick Signed a Listing Agreement with Paul, a Real Estate

Rick signed a listing agreement with Paul, a real estate agent.The agreement stated that if Rick or anyone acting on his behalf should sell his property, Paul would still be entitled to his commission.This type of an agreement is a(n) :

A) exclusive right to sell.
B) open listing.
C) exclusive agency.
D) none of the above.
E) two of the above.