The question pertains to the guidelines of the National Professional Standards for Teachers (NPST) which categorize teachers based on their acquired competencies. Let's explore the options to determine the correct answer:

1. Proficient, Advanced, and Expert: These terms are commonly used in professional standards across various contexts to define progressively higher levels of competence and expertise. In many educational frameworks, this hierarchy represents a continuum of professional development for teachers.
2. Novice, Trainee, and Experienced: While these terms could apply to the development stages of individuals in a training program or profession, they do not specifically align with the levels defined in the NPST.
3. Beginner, Apprentice, and Skilled: Similar to the previous option, these terms describe stages of development, particularly in vocational training. However, they are not the specific terms used by NPST.
4. Reflexive, Reflecting, and Reflective: These terms describe approaches to learning and self-assessment but are not levels of competency as defined by NPST.

Based on the analysis above, the correct answer is Proficient, Advanced, and Expert. These levels are part of the NPST guidelines to categorize teachers according to their competency levels. This classification helps in recognizing and supporting teacher growth and ensuring quality education.

Therefore, the correct answer is the first option: Proficient, Advanced, and Expert.