The entity integrity rule states that a primary key attribute can be null. Thus the statement is false.
<h3>What is an entity?</h3>
An entity is refer to any object that exists in reality. These entities are Independent in nature. Each row in a table should be a distinct entity, which is ensured by entity integrity.
The entity integrity rule states that a primary key attribute can not be null as it shows unique characteristics of an entity.No primary key value can be null according to the entity integrity constraint because it is needed to identify specific attribute values in relation.
Therefore, the statement is False.
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The answer is D, the other ones are facts or scenarios meaning that they had to occur to be noticed.
<span>Statistically speaking, in terms of puberty timetables, early maturing girls are the most at risk of becoming depressed. This is because of the development of the hormones of the girl. It is the time when they start to question their environment about the importance of her feelings and how to interact with them. Also, their hormones are two compared to boys which has only one.</span>
That is science, not social studies