The provisions of this Subtitle shall apply, within its terms, to all employees occupying positions within the classified service, provided: That the provisions of this Subtitle shall not apply to any employee occupying a position in the classified service under the terms of a limited-term appointment, except as expressly stated otherwise; That the provisions of this Subtitle shall not apply to any employee occupying a position in the classified service under the terms of a temporary/provisional or temporary/emergency appointment, except as expressly stated otherwise; and, That the provisions of this Subtitle shall apply to any employee occupying a position in the classified service where said employee is governed by a collective bargaining agreement negotiated and approved pursuant to the provisions of Chapter 13A of the Prince George's County Code of Ordinances and Resolutions, titled "Labor Code," except as specifically provided otherwise under the provisions of Section 16-233. The provisions of this Subtitle shall not apply to any employee occupying a position in the exempt service, except as expressly stated otherwise.