are shown in double ovals?

A.simple attributes

b.composite attributes

c.derived attributes

d.multivalued attributes

each entity type will have a collection of entities stored in the database is called?

A.attribute

b.week entity

c. entity set

d.relationship

sometimes row-ids or sequential number are assigned as keys to identify the rows in a table is called?

A.artificial key

B.super key

c.unique keys

d.primary key