Given only the following excerpt of an E-R model:
Which of the following is known to be true?
A)There are more instances of ENTITY A than there are instances of ENTITY B in the user's environment.
B)A single instance of ENTITY B may be related to many instances of ENTITY A.
C)A single instance of ENTITY A must be related to many instances of ENTITY B.
D)ENTITY A has a minimum cardinality of one.
E)The degree of the relationship is "many."

Question

Given only the following excerpt of an E-R model: 
Which of the following is known to be true?
A)There are more instances of ENTITY A than there are instances of ENTITY B in the user's environment. 
B)A single instance of ENTITY B may be related to many instances of ENTITY A. 
C)A single instance of ENTITY A must be related to many instances of ENTITY B. 
D)ENTITY A has a minimum cardinality of one. 
E)The degree of the relationship is "many."

Quizplus · Accepted Answer

The excerpt indicates that there is a relationship between ENTITY A and ENTITY B, and specifically that "A single instance of ENTITY B may be related to many instances of ENTITY A." This means that one instance of ENTITY B can be associated with multiple instances of ENTITY A, but it does not provide information about the number of instances of ENTITY A or ENTITY B, or the minimum cardinality of ENTITY A. The degree of the relationship is also not explicitly stated.

Given Only the Following Excerpt of an E-R Model