Q: A _________ integrity constraint requires that the values appearing in specified attributes of any tuple in the referencing relation also appear in specified attributes of at least one tuple in the referenced relation.

A Referential
B Referencing
C Specific
D Primary
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Primary Key: A primary is a column or set of columns in a table that uniquely identifies tuples (rows) in that table.
Super Key: A superkey is a set of one or more columns (attributes) to uniquely identify rows in a table.
Candidate Key: A super key with no redundant attribute is known as a candidate key
Alternate Key: