Final answer:
It is the obligation of both the buyer's agent and the seller's sub-agent to disclose a buyer's financial ability to purchase a home.
Step-by-step explanation:
In the context of real estate transactions, dealing with imperfect information and asymmetric information is often a concern. It is the obligation of the buyer's agent to disclose a buyer's financial ability to purchase a home. The buyer's agent is tasked with acting in the best interests of their client, which includes providing relevant information to the seller about the buyer's financial status. Moreover, it is also the responsibility of the seller's sub-agent, if one exists, to disclose this information as they represent the interests of the seller but also must ensure that the buyer is qualified to make the purchase. Therefore, the correct answer to the student's question is Both (1) Buyer's agent and (3) Seller's sub-agent.