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Which of the following can be addressed by enforcing a referential integrity constraint? | |
A. | All phone numbers must include the area code [Wrong Answer] |
B. | Certain fields are required (such as the email address, or phone number) before the record is accepted [Wrong Answer] |
C. | Then entering an order quantity, the user must input a number and not some text (i.e., 12 rather than ‘a dozen’) [Wrong Answer] |
D. | Information on the customer must be known before anything can be sold to that customer [Correct Answer] |