Extend relationship represents in a certain scenario, the base case requires data produced by the extended use case.  ii.   A post-condition is an assertion guaranteed to be true when the use case ends. iii.  An event that causes a use case to begin is called trigger iv.  None of the above

Oracle 12c: SQL
3rd Edition
ISBN:9781305251038
Author:Joan Casteel
Publisher:Joan Casteel
Chapter1: Overview Of Database Concepts
Section: Chapter Questions
Problem 15MC: Which of the following symbols represents an optional relationship in an E-R model? a. a straight...
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  1. Which of these statements are true?

    i.    Extend relationship represents in a certain scenario, the base case requires data produced by the extended use case. 
    ii.   A post-condition is an assertion guaranteed to be true when the use case ends.
    iii.  An event that causes a use case to begin is called trigger
    iv.  None of the above

a. i, ii, iii.

b. ii, iii.

c. iii.

d. None of the above is true.

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