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