Final answer:
In Delaware, referring to oneself as a CRB—certified real estate broker—requires an occupational license. Adding "real estate professional" to business cards or earning income from rental properties does not require a license. Working as an assistant to a real estate broker also does not necessarily require a license, unless performing regulated tasks.
Step-by-step explanation:
In Delaware, certain activities require a professional to hold an occupational license, which assures that the individual has attained a specified level of education or has passed certain tests. When reviewing a list of activities to determine those requiring a license in Delaware, the activity of referring to oneself as a CRB—certified real estate broker—would indeed require an occupational license, as a real estate broker is a profession that commonly requires state licensing.
On the other hand, simply adding "real estate professional" after one's name on business cards does not itself require a license, as it is not a claim of certification or licensure. Earning a primary income through owning rental properties also does not require a license, as it pertains to property ownership rather than providing a licensed service. Lastly, working as a personal assistant to a licensed real estate broker does not necessarily require a license, unless the tasks performed fall into duties that are regulated and require a licensed professional in the field of real estate.