Andragogy is commonly known as:

Andragogy refers specifically to the methods and principles used in adult education. This concept emphasizes the importance of understanding how adults learn differently compared to children, often focusing on the self-directed nature of adult learners, their life experiences, and their intrinsic motivations. Unlike pedagogy, which is more concerned with child-directed learning, andragogy applies specifically to teaching strategies designed for adults, making "adult learning" the most suitable description.

The other choices either suggest a more general or less accurate concept of learning approaches. For instance, "teacher-directed learning" pertains to traditional education methods that are often more applicable to younger students and do not represent the self-directed nature of adult learning. Similarly, "student learning" is broader and does not specifically relate to the distinct principles that govern how adults engage with educational content. Thus, identifying andragogy as "adult learning" aligns precisely with its foundational premise.