Final answer:
A buyer's broker may rely on the square footage provided by a listing broker, but should verify it if they feel it is incorrect.
Step-by-step explanation:
A buyer's broker may rely on the square footage information reported by a listing broker. However, if the buyer's broker feels that the square footage is incorrect, they should verify it themselves. Therefore, both options 2 and 3 are correct, as a buyer's broker has the responsibility to ensure the accuracy of the square footage if they have doubts.