The best course of action that Ruby has to take is to tell Martin that she cannot represent him in the purchase of this property.
This is because she is into the selling of property. The first line of job that she does is to act as an agent for those selling.
In the situation that the house is to bought an agent that helps to buy properties should be contacted.
Read more on real estate agents here:
https://brainly.com/question/13957036
#SPJ1