Final answer:
The question refers to a Net listing, where a real estate agent might demand a fee over a set net price and could be subject to disciplinary action for such demand.
Step-by-step explanation:
The correct answer to the question is b) Net listing. A net listing is a type of real estate listing agreement where the seller sets a net price that is acceptable for the property. If the actual sale price exceeds that net price, the listing agent is allowed to keep the excess as their commission. This type of agreement can be problematic and is even illegal in some states because it can potentially create a conflict of interest between the agent's motivation to secure a higher price and the seller's desire to sell the property. Disciplinary action could indeed be imposed on a licensee who demands a fee for a sale price under a net listing since it could be considered that they did not act in the seller's best interests.