Under the recently amended Texas code, a person selling or offering to sell an option or assigning an interest in a contract to purchase real property is engaged in brokerage under which of the following circumstances? Select one: a. When they fail to accurately disclose to potential buyers the nature of the interest offered. b. If they do not have the appropriate real estate certification in the area. c. They are not employed by a financial institution. d. They do not hold an active securities and exchange sales license