Donald Van Dorn has entered into a listing agreement to sell his home through Broker David Polk. Polk is the only broker who has the right to sell the home during the listing period. But Van Dorn has reserved the right to avoid liability for the commission by selling the home himself. This kind of agreement is called:

An exclusive agency

Explanation:

An exclusive agency gives one broker the exclusive right to sell a particular property, though they may agree to pay a portion of their sales commission to a broker who procures a buyer. An exclusive agency agreement allows the seller to sell the property directly and not have to pay a commission to the listing broker.

This protection lets the agent receive full commission, in case the buyer they brought changes their mind and comes back later, after the agreement has expired.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.