Final answer:
Mark's request is considered an unconditional termination of the listing agreement, which is the ending of the contract without conditions before its expiration.
Step-by-step explanation:
Homeowner Mark's request to Tom at KW Realty to remove the listing from the MLS before the listing agreement expires may be considered a request for unconditional termination of the agreement. The term 'unconditional termination' refers to ending a contract without any conditions attached, usually in accordance to the terms of the original agreement. In typical real estate contracts, a listing agreement can be terminated by the homeowner by giving a notice prior to its expiration, provided this action is in compliance with the terms laid out in the agreement. In this case, taking the listing off the MLS cannot be performed unilaterally by Mark without KW Realty's agreement, as the listing is under a contractual agreement until it expires.