Q: The subset of super key is a candidate key under what condition?

A No proper subset is a super key
B All subsets are super keys
C Subset is a super key
D Each subset is a super key
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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: