(b) No class of vehicle dealer as defined in article six or six-c of this chapter may employ an unlicensed motor vehicle salesperson on or after the first day of January, two thousand eight. No person may sell vehicles for more than one vehicle dealer unless the commissioner grants a written waiver.
(c) Any person employed by licensed dealers as a salesperson immediately preceding the effective date of this section is exempt from the requirements of the background investigation and the written test and payment of the fee for the background investigation provided in section four of this article.