Final answer:
The real estate agent should not discourage the buyer from purchasing the house.
Step-by-step explanation:
The real estate agent should do all but Option 4: Discourage the buyer from purchasing the house.
In the sale of a house that requires a lead-based paint disclosure, the agent should provide the lead-based paint disclosure to the buyer, inform the buyer about potential lead-based paint hazards, and advise the buyer to seek an independent lead inspection. However, the agent should not discourage the buyer from purchasing the house.