Which of the Following Notations in an E-R Diagram Means

question 72

Multiple Choice

Which of the following notations in an E-R diagram means that the entity is optional and a relationship need not have an entity of that type?

• A) vertical bar
• B) arrow
• C) double line
• D) small oval
• E) triangle

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Definitions:

Relapse

A return to a previous state of health deterioration or the reappearance of symptoms after a period of improvement or recovery.

Anxious/Fearful Cluster

A group of personality disorders characterized by prominent anxiety and fear, including avoidant, dependent, and obsessive-compulsive disorders.

Personality Disorder

A mental condition defined by persistent maladaptive behavior, cognitive processes, and internal experiences that are displayed in various situations and differ from what is considered normal in the person's cultural context.

Enlarged Ventricles

A condition where the brain's ventricles, which contain cerebrospinal fluid, are larger than normal, often associated with brain disease or injury.