Answer:
The correct answer is: a unique characteristic pertaining to a class..
Explanation:
Ontology is the branch of metaphysics that analyzes the different fundamental entities that make up the Universe. Many of the questions pertaining to philosophical thinking correspond to this study; Some examples are the eternal search for truth about the existence of God, ideas (mental type entity) and numbers (abstract entity).
Attributes are about certain adjectives or concepts that allow us to classify specific entities. For example, when we say that silk is soft, we are using one of its properties (softness) to give a particular meaning to the existence of this material.