A

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Q. Which of the following can be addressed by enforcing a referential integrity constraint?

  • (A) all phone numbers must include the area code
  • (B) certain fields are required (such as the email address, or phone number) before the record is accepted
  • (C) information on the customer must be known before anything can be sold to that customer
  • (D) then entering an order quantity, the user must input a number and not some text (i.e., 12 rather than ‘a dozen’)

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