(a) No violation of any of the provisions of this act on the part of any salesperson, associate broker, or other employee of any licensed broker, shall be grounds for the revocation or suspension of the license of the employer of such salesperson, associate broker, or employee, unless it shall appear upon the hearings held, that such employer had actual knowledge of such violation.

(b) No violation of any of the provisions of this act on the part of any cemetery broker or cemetery salesperson or other employee of any registered cemetery company, shall be grounds for the revocation or suspension of the registration certificate of the cemetery company, unless it shall appear that such cemetery company had actual knowledge of such violation.

(c) A course of dealing shown to have been followed by such employee shall constitute prima facie evidence of such knowledge upon the part of his employer.

(d) No violation of any of the provisions of this act on the part of any campground membership salesperson or time-share salesperson shall be grounds for the revocation or suspension of the license of the broker responsible for supervising such salesperson unless it shall appear upon the hearings held that such broker had actual knowledge of such violation. A course of dealing shown to have been followed by such salesperson shall constitute prima facie evidence of such knowledge upon the part of such broker.