Which of the following statements is true about referential integrity?
A. It checks that no component of a primary key can have a null value and no duplicate entries can exist.
B. It checks that the value of a primary key must be consistent throughout the life of an instance.
C. It distinguishes between null values and zero entries.
D. It checks that no record in a child table can exist if its corresponding record is not available in the parent table.
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