In database terminology, keys are used to uniquely identify records (rows) in a table. Let's define the keys in the options.
(A) Super Key: A super key is any set of one or more attributes that, taken collectively, can uniquely identify a record in a table. It is the broadest definition of a key that ensures uniqueness.
(B) Candidate Key: A candidate key is a minimal super key. This means it's a super key from which no attribute can be removed without losing the uniqueness property. A table can have multiple candidate keys.
(D) Primary Key: The primary key is one of the candidate keys that is chosen by the database designer to be the main identifier for the table. It cannot contain null values.
(C) Alternate Key: Any candidate key that is not chosen to be the primary key is called an alternate key.
The question asks for A set of one or more attributes that can uniquely identify a record, which is the exact definition of a Super Key. While Candidate and Primary keys also do this, Super Key is the most general and correct term for any such set.