What Is the Primary Difference Between an Entity and an Attribute

What is the primary difference between an entity and an attribute?

A) an attribute is a table, an entity is a column from the attribute table
B) an entity is specific, whereas an attribute is not data at all but brainstorming ideas that take place before the entity is created
C) an attribute refers to applications, and an entity refers to executives
D) an entity is a table that stores information about people, places, or events, whereas an attribute is a column or specific field of the data elements associated with an entity