Dana Halsey Is Chair of the Purebred Marmoset Society,which Maintains

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Dana Halsey is chair of the Purebred Marmoset Society,which maintains a database of registered purebred marmosets and their breeding history.Originally,the database was stored on index cards,but recently Dana has been exploring the use of a computerized system.One file in the system will store the name,birth date,and other characteristics of all of the marmosets that have been registered.Each marmoset is uniquely identified by a registration number.A second file will contain data that link each marmoset to its male and female parents by means of their serial numbers.The primary key in the second file is:

A) Name
B) Birth date
C) Constructed from two foreign keys.
D) The primary key in the first file.