Which of the following psychological statements is most authentic and scientifically valid regarding the real psychological implications of 'Concept Learning' and 'Principle Learning / Rule Learning' among the eight types of learning propounded under Robert Gagne's 'Conditions of Learning', and their role in developing higher-level cognitive structures and 'Problem Solving' in classroom teaching?

According to Robert Gagne's hierarchical theory of learning, the eight types of learning progress from simple to complex. Here, 'Concept Learning' means recognizing and classifying common features among various stimuli, while 'Principle Learning' is a complex cognitive process of understanding relationships between two or more concepts. Scientifically, clear foundational concepts are a mandatory condition for learning any rule or principle, as higher-level problem-solving is possible through their combination.