What real estate activity can Adrian, who does not have a real estate license, legally perform in Georgia?

The correct answer pertains to Adrian selling his dad's house under a power of attorney. In Georgia, a power of attorney is a legal document that allows one person to act on behalf of another. If Adrian has a power of attorney that grants him the authority to sell his father's property, he is legally allowed to do so without having a real estate license. This is because the actions performed under a power of attorney are considered to be the legal responsibilities and authorization of the individual who granted the power, not an independent real estate transaction by Adrian.

Other activities listed would typically require a real estate license. For instance, negotiating a friend's condo purchase for a fee could be viewed as engaging in real estate transactions which are regulated under Georgia law. Similarly, negotiating the sale of his brother's sod farm or advertising a friend's property for sale both imply activities that fall within the realm of real estate brokerage services which also require a license.