Question: Select the TWO possible reasons why 1 : 1 relationship might exist. Select one or more: a . It is the freedom of the database

Select the TWO possible reasons why 1:1 relationship might exist.
Select one or more:
a.
It is the freedom of the database designer.
b.
One entity related to only one other entity, and vice versa.
c.
Sometimes it means that the entity components were not defined properly
d.
It shows the possibility of two entities that actually belong in the same table

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