Q: Which one of the following cannot be taken as a primary key ?

A Id
B Register number
C Dept_id
D Street
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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: