Question

__________is a unique key.a) Primary keyb) Foreign keyc) Electronic keyd) Databse key

Answer 1

__Primary_key__ is a unique key.

Answer 2

Primary key is a unique key. 

If you compose multiple columns, you need to determine the data weather a row is unique and if the rows in a table were mailboxes then the primary key would be the listing street addresses.

So primary key is a unique key which can be used to organize the data and columns.