There shall be four classes of credentials issued to real property appraisers as follows:
(1) Trainee real property appraiser, which classification shall consist of those persons who meet the requirements set forth in section 76-2228.01;
(2) Licensed residential real property appraiser, which classification shall consist of those persons who meet the requirements set forth in section 76-2230;
(3) Certified residential real property appraiser, which classification shall consist of those persons who meet the requirements set forth in section 76-2231.01; and
(4) Certified general real property appraiser, which classification shall consist of those persons who meet the requirements set forth in section 76-2232.