A use case: A) summarizes an activity, its trigger, input, and ...

[penza]

A use case:
 
  A) summarizes an activity, its trigger, input, and output.
  B) describes a subsystem of a data flow diagram showing how the processes use data produced by other processes.
  C) describes how the data is partitioned into programs for different users.
  D) shows when the data is updated, read, created or deleted.

Question 2

Which of the following best defines a candidate key?
 
  A) It is an arbitrary, random key with no business meaning
  B) It is an attribute that naturally belongs to an entity
  C) It is made of two or more attributes combined
  D) It is an attribute that could potentially be used for a primary key

[Jossy]

Answer to Question 1

A

Answer to Question 2

D