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For the table Customers ( CustomerID , LastName, FirstName, StreetAddress, City, State, ZipCode, EmailAddress, PhoneNumber, BirthDate ) , which field is a secondary key? a

For the table Customers

(

CustomerID

,

LastName, FirstName, StreetAddress, City, State, ZipCode, EmailAddress, PhoneNumber, BirthDate

),

which field is a secondary key?

.

LastName, FirstName

.

BirthDate

.

PhoneNumber

.

CustomerID

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