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 only specifies that ENTITY B may be related to many instances of ENTITY A, but does not provide any information about the cardinality or number of instances of either entity. The degree of the relationship is also not specified. Choice A, C, and D are not supported by the given excerpt.

Given Only the Following Excerpt of an E-R Model