Which of the following correctly identifies common scale degrees in a major scale?

The correct identification of common scale degrees in a major scale encompasses the roles played by the various degrees of the scale. In a major scale, the scale degrees are often labeled according to their function, which provides a framework for understanding harmony and melody.

The tonic, which is the first degree of the scale, serves as the home base or point of resolution. The supertonic is the second scale degree, followed by the mediant in the third position, which provides a sense of tension and expectation before resolving back to the tonic. The subdominant is the fourth degree and plays a crucial role in establishing the harmonic structure.

In contrast, other options include inaccuracies or substitutions that do not align with the traditional labels used in music theory. For example, while the leading tone is indeed a significant part of the major scale, mislabeling or using incorrect terms like "Mediatic" or labeling the leading tone inconsistently can create confusion regarding their placement and function in a major scale context.

Thus, the identification in the correct response encompasses the foundational scale degrees and their respective roles, providing clarity on how these degrees contribute to the overall structure and tonal framework of major scales in music.