I’d go with b. egotistical, i’m not entirely sure though. It seems like he is trying to appeal to the suspects EGO
A composite primary key<span> is a set of several primary </span>keys<span> that, together, uniquely identifies each record.</span>
Primary keys are used as identifiers of composite entities. In this case each primary key combination is allowed only once in the *:* relationship.
Other case where primary keys are used is as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity.
Answer:
I think its 2, but correct me if i'm wrong. :>
Explanation:
I have annotated the errors in the picture.
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<em>Hope this helps :)</em>
