Answer: Option B
When the minimum number of instances of an entity is one, you know which of the following?
A. Mandatory one
B. Optional one
C. Mandatory many
D. Cannot tell
A good identifier is which of the following?
A. One that can change over time
B. Can be null
C. One that is unique
D. Be intelligent
Cardinality specifies the number of instances of one entity that can be associated with each instance of another entity.
A logical representation of the data for an organization or for a business area is known as an entity-relationship model.