Marsha is a newly$-$licensed real estate agent, who signs a contract with Miguel to represent him in on Tuesday; the following day, she signs a contract to represent Mary to represent her to search for a house to purchase. As luck would have it$,$ Mary wants to purchase Miguel's house. Marsha now has an issue, under traditional agency jurisprudence, with

conflict of interest

dual agency

usurping an opportunity

imputed knowledge

confidentiality.