An E-R diagram is a graphic method of presenting ----------
A. Primary keys and their relationships
B. Primary keys and their relationships to instances
C. Entity classes and their relationships
D. Entity classes and their relationships to primary keys
Answer:C
An E-R diagram is a graphic method of presenting ----------
A. Primary keys and their relationships B. Primary keys and their relationships to instances C. Entity classes and their relationships D. Entity classes and their relationships to primary keys